Flecs v3.2.0

Release announcement

Flecs 3.2 is out!

Release notes

This version includes the following bugfixes:

• Fix issue with batched set commands and emitting OnSet events
• Fix issue where bitset iteration index could go out of bounds
• Fix issue where ecs_get_target would try inheritance for relationship with DontInherit
• Fix error in custom_phases_no_builtin C++ example
• Fix issue in JSON serializer with large string values
• Fix issue in JSON serializer with entity ids at offset
• Fix potential crash in ecs_get_target_id_for
• Correctly set ecs_iter_t::offset in component hooks
• Fix issue with suspending deferred mode
• Fix issue in cursor API with double assignment after dotmember
• Fix issue in script parser with binary operator followed by component assignment
• Fix issue with vectors in JSON serializer
• Fix issue where comments inside value blocks didn't work correctly in Flecs script
• Fix issue with setting name string that overlaps with existing name in deferred mode
• Add missing implementation of ecs_rule_get_filter
• Fix issue with command ordering when setting name after reparenting
• Fix compilation issue with new version of emcc
• Fix issue where event for multiple ids triggered for wrong entity
• Fix issue where event for multiple ids triggered multiple times for same observer
• Fix issue where id in table was not updated after calling ecs_set_entity_generation
• Fix issue that prevents using ecs_get_target_for_id from stage
• Fix issue with component registration across binaries in multithreaded applications
• Fix memory leak in HTTP server
• Fix issue with importing C module in multiple worlds
• Fix component registration issue with binaries compiled by different compilers
• Fix issue with component registration of world::vector
• Correct for overshoot value when returning delta_system_time for interval systems

This version includes the following improvements:

• [c] Add missing const qualifiers to query functions
• [c] Add missing const qualifier to ecs_id_in_use
• [c] Add ecs_get_parent convenience function
• [cpp] Add flecs::rule::move method
• [cpp] Don't assert when creating invalid rule, add flecs::rule::is_valid method
• [cpp] Add flecs::entity_builder::set_alias method
• [cpp] Add API for singleton pairs to flecs::world
• [cpp] Ensure world is cleaned up when app().run() returns
• [rules] Rule engine refactor
• [rules] Improved support for Not, Optional, Or operators
• [rules] Added support for fuzzy name matching
• [rules] Added support for dependent terms
• [rules] Added a query profiler for analyzing term performance
• [rules] Many improvements to performance, VM, data structures, runtime
• [rules] Add option to auto-match unresolved identifiers at query creation time by name
• [rules] Add support for using any (_) variable as term source
• [rules] Add support for queries that start with Not/Optional terms
• [rules] Add support for transitive queries with any (_) target
• [rules] Add support for transitive queries with self modifier for target
• [rules] Allow for usage of relationships other than IsA for component inheritance
• [rules] Add support for parsing variable values from argument string
• [rules] Add performance optimization for trivial rule queries
• [filters] Default to InOutNone if the term type is not known beforehand
• [filters] Change interface for Or operator to allow for neighboring Or terms
• [queries] Improve query sorting performance
• [queries] Add assert on invalid order_by component id
• [core] Implement relationship flattening
• [core] Replace all remaining occurrences of ecs_vector_t with ecs_vec_t
• [core] Cache (ChildOf, *) id record on world for improved performance
• [core] Cache (Identifier, Name) id record on world for improved performance
• [core] Add AlwaysOverride component property
• [core] Ensure children of a prefab are also tagged as prefabs
• [core] Add stricter check on adding properties to components that are already in use
• [meta] Add conversion to cursor API from bool to int
• [meta] Throw less confusing error in cursor API when assigning out of bounds element/member
• [rest] Add validity checks on offset/limit parameters
• [rest] Add functions to call REST API from C
• [http] Implement request caching (replaces caching mechanism of REST API)
• [doc] Fix conflicting declaration in quickstart example
• [doc] Fix outdated code example in systems manual
• [doc] Add build instructions to quickstart for cmake and bake
• [doc] Fix incorrect link in README to prefab documentation
• [doc] Add parent(), target_for() to query section of relationship manual
• [doc] Expand explorer section of REST manual with query examples
• [script] Add experimental support for loading managed scripts
• [script] Add experimental support for assemblies
• [script] Allow for setting nested members in expression
• [script] Add support for deriving variable name from assigned member
• [script] Add support for adding variables as components
• [script] Make EXPR/META addon mandatory when using script addon
• [script] Add support for using foo.* syntax
• [script] Add support for module foo syntax
• [script] Add Flecs script tutorial
• [script] Add support for assigning singletons with $ :- Component{}
• [log] Add ecs_log_get_level

Breaking Changes

• The interface for creating queries with Or operators has changed (#466 (comment))
• The ecs_vector_t type has been removed from the source and replaced with ecs_vec_t (#466 (comment))

Known issues

#844
#765
#714
#620
#478
#314

New Contributors

• @SaadiqDaniels made their first contribution in #933
• @icolwell made their first contribution in #937
• @benjitrosch made their first contribution in #944

Full Changelog: v3.1.5...v3.2.0

Flecs v3.1.5

Highlights

• A big upgrade to the reflection framework which can now serialize/deserialize custom (including STL) types!
• New functions to serialize & deserialize a world to & from JSON
• Improved performance of iterating queries with tag fields (+30-50%)
• Improved performance of table creation in apps with lots of cached queries (+70-90%)
• Improved performance of notifying multiple observers for the same event (+20-30%)

Release notes

This version includes the following bugfixes:

• Fix issue where symmetric relationship would be cleaned up before its observer
• Fix issue in debug mode where entity generation check could use wrong index in dense array
• Fix issue where on_set hook was not called before observers during command batching
• Changed incorrect return type of ecs_id_is_tag to bool
• Ensure destructor is called on moved away from value in command queue
• Fix memory leaks when using a global flecs::world object
• Ensure destructor is called on moved away from column when merging tables
• Fix lambda compilation issue when using Visual Studio 2017

This version includes the following improvements:

• [core] Allow for ecs_ensure to be called from stage
• [core] Add Traversable property to allow for relationships that are acyclic but not traversable
• [core] Only apply DontInherit property to IsA traversal
• [meta] Serialization & deserialization support for opaque types
• [meta] Add methods for deserializing values & entities to C++ API
• [json] Add option to JSON serializer to serialize all contents of a matched table
• [json] Add functions for serializing/deserializing world to/from JSON
• [observers] Improve performance of invoking multiple observers for the same event
• [queries] Improve detection and handling of query terms without data
• [cpp] Remove redundant world argument from flecs::entity constructor in id::second()
• [cpp] Add begin/end methods to flecs::type so it can be iterated
• [cpp] Add entity::view method for safe upcast from staged flecs::entity object
• [cpp] Automatically disable enum reflection for compilers that don't support it
• [docs] Improve documentation of get_mut
• [docs] Rewrite of the FAQ
• [docs] Add query example for singletons, add singleton section to quickstart
• [ux] Add assert when not using stage when creating iterator in multi threaded world
• [internals] Use observers for notifying queries of new tables
• [internals] Improve performance of ecs_bulk_init by using faster function to update entity index
• [internals] Implement small utility API for parsing JSON strings

Breaking Changes:

• Inconsistencies in the naming of JSON deserialization functions have been fixed (#466 (comment))
• The behavior of the Acyclic property has been split up into an Acyclic and Traversable property (#466 (comment))

Known issues:
#844
#765
#714
#620
#478
#314

New Contributors

• @BeanCheeseBurrito made their first contribution in #923
• @Thinkofname made their first contribution in #928

Full Changelog: v3.1.4...v3.1.5

Flecs v3.1.4

Highlights

• Performance improvements for many core ECS operations! 🎉 (see below)
• A new benchmark suite with more than 100 tests: https://github.com/SanderMertens/ecs_benchmark
• Changes made to an existing component with a deferred get_mut are now immediately visible to systems & other get_mut calls (#466 (comment))

Performance improved in this release for 116 in a total of 120 benchmarks! Here are a few of the most significant improvements between v3.0.0 and v3.1.4 (which also includes improvements from command batching & the observer cache):

Benchmark	v3.0.0	v3.1.4	Difference
has_id	8.92ns	4.38ns	+50.90%
get_id	7.18ns	3.69ns	+48.61%
get_mut_id	12.22ns	7.35ns	+39.85%
set_id	29.13ns	11.85ns	+59.32%
add_remove_1_tag	20.43ns	17.63ns	+13.71%
add_remove_cmd_16_tags	40.40ns	17.55ns	+56.56% (command batching)
get_mut_cmd_16	47.17ns	18.65ns	+60.46% (command batching)
create_delete_tree_depth_10	19.27us	8.24us	+57.25%
emit_propagate_depth_10	1.52us	194.33ns	+87.25% (observer cache)
query_iter_16_tags_4_terms	56.39ns	26.15ns	+53.63%

Release notes

This version includes the following bugfixes:

• Ensure HAVE_EXECINFO is defined on all platforms
• Fix compilation issue on clang 16 (thanks @gorilux!)
• Add missing flecs_cpp.c to the meson build file
• Fix issue where non-instanced query with multiple traversal terms did not match entities
• Fix broken links in documentation
• Remove <strong></strong> from documentation markdown headers
• Fix issue where atomic id generation was used without threading
• Fix issue where flecs::ref would store stage instead of world
• Fix assert in observer cache after deleting parent with relationship to child
• Fix issue with passing string to ecs_set_name that overlaps with current name
• Fix compile error when passing existing object to set<R, T>
• Fix memory corruption when using ecs_bulk_init with existing table
• Fix command batching issue with adding ChildOf pair while removing name

This version includes the following improvements:

• [core] Require entities to be alive for ECS operations
• [core] Deferred ecs_get_mut_id now returns reference to actual component if it exists (thanks @dmlary!)
• [c] Add matching *_DECLARE convenience macro's for each *_DEFINE macro
• [cpp] Add world::get_ref
• [docs] Lots of small improvements to documentation (thanks @copygirl!)
• [docs] Move build instructions from README to Quickstart
• [docs] Improve build instructions for gcc/clang on Windows
• [ux] Add example for entity::emplace
• [internals] Faster map implementation that no longer stores a variable size payload
• [internals] Use array vs. sparse set to lookup id records with low ids
• [internals] Replace usage of ecs_vector_t in sparse set with faster ecs_vec_t
• [internals] Add new/faster sparse set operations that assume id is alive
• [internals] Cleanup sparse set API
• [internals] Replace code of ecs_has_id with faster implementation
• [internals] Remove redundant code from table graph operations
• [internals] Improve performance of defer/suspend mechanism
• [internals] Improve performance of pipelines queries by adding self flag to System term

Breaking Changes:

• Entities now must be alive before using with ECS operations (#466 (comment))
• Deferred get_mut now returns pointer to existing component (#466 (comment))

Known issues:
#844
#765
#714
#620
#478
#314

New Contributors

• @copygirl made their first contribution in #902
• @gorilux made their first contribution in #906
• @dmlary made their first contribution in #908

Full Changelog: v3.1.3...v3.1.4

Flecs v3.1.3

Highlights

• New documentation website!
• Query rematching performance improvements

Release notes

This version includes the following bugfixes:

• Fix issues with looking up numerical ids from scope (e.g. foo::bar::100)
• Fix issue where reachable cache invalidation would not iterate all ids
• Fix issue with parsing entity path that can't fit in 32bit int
• Fix issue where filter with self term is created before id
• Fix issue where id records were incorrectly deleted for ecs_remove_all/ecs_delete_with
• Fix issue with adding ChildOf pair and deferred ecs_entity_init
• Fix issues with updating EcTableHasObserved flag (fixes reachable cache asserts)
• Fix issue where id record could not get cleaned up correctly (fixes reachable cache asserts)
• Add move hook to Pipeline component (fixes segfault when using multiple pipelines)

This version includes the following improvements:

• [entities] Use empty separator string to prevent tokenization of name in ecs_entity_init
• [cpp] Add const to query class methods
• [cpp] Add const to iterable class methods
• [cpp] Add emplace_override for pairs
• [queries] Prevent query rematching from happening more than once per query/frame
• [pipelines] Prevent adding empty operation at end of schedule
• [table] Support calling ecs_table_get from stage
• [units] Add units for hyperlinks, images and files
• [units] Add Length::Pixel unit
• [docs] Add doxygen headers to source and include files
• [docs] Add edcs_get_depth, entity_view::depth, ecs_table_get_depth, table::depth functions
• [docs] Add doxygen documentation
• [docs] Replace old flecs.dev site with doxygen generated one
• [docs] Remove dead links to docsforge pages
• [docs] Add instructions for how to fix compilation errors related to time/socket functions
• [ux] Improved C/C++ APIs for working with tables
• [ux] Remove redundant tracing when component is reregistered
• [ux] Throw assert when trying to delete entity/component that is still queried for
• [internals] Move code out of query iterator in preparation of union/bitset support for filters
• [internals] Remove redundant relationship traversal call from table edge creation code

Known issues:
#844
#765
#714
#620
#478
#314

Flecs v3.1.2

Highlights

• The Flecs explorer can now edit component values!
• Systems can now be registered with an OnStart phase which is ran only in the first frame

Release notes

This version includes the following bugfixes:

• Fix issue with C++ bitmask binding (type must now inherit from flecs::bitmask)
• Fix issue where use_low_id was not set by ECS_COMPONENT
• Fix issues with invoking ctor/move/dtor when merging tables
• Fix issue where observer could be invoked for wrong table
• Fix invalid read in multithreaded app after pipeline rebuild
• Fix race condition between pipeline worker and no_readonly system
• Fix issue where term with wildcard pair & self flag would not iterate all permutations
• Fix issue where get_mut<First, Second> would always return First*

This version includes the following improvements:

• [cpp] Add missing const to flecs::world methods
• [cpp] Add missing const to flecs::entity_view methods
• [cpp] Change argument type of run_pipeline to flecs::entity_t
• [cpp] Add observer::query method
• [pipeline] Refactor of pipeline code
• [pipeline] Add OnStart phase for systems that are ran only at startup
• [rest] Add set endpoint for remotely setting component values
• [rest] Add delete endpoint for remotely deleting an entity
• [internals] Add debugging instrumentation to allocator
• [internals] Remove redundant code
• [internals] Add missing tests for get pair operations
• [internals] Split off entity filter code (union relationships/bitsets) from query iterator code

Known issues:
#844
#765
#714
#620
#478
#314

Flecs v3.1.1

Highlights

• Observer refactor with new hierarchy cache that can improve event propagation performance up to 200x
• Systems are now excluded from a schedule when their module or phase is disabled
• Single threaded systems are now guaranteed to run on main thread
• New journaling addon

Release notes

This version includes the following bugfixes:

• Fixed issue with page/worker iterators and InOutNone
• Fixed issue with invoking on_add hooks when using ecs_bulk_init
• Fixed issue with searching for union relationships
• Fixed C++ enum relationships on Apple Clang 14
• Fixed issue with batched deferred emplace and remove
• Fixed issue where ctx/binding_ctx was not set for multithreaded systems
• Fixed race condition with no_readonly systems in multithreaded apps
• Fixed issue where pipeline would resume at incorrect point in schedule after merge
• Fixed issue with batched clear commands
• Fixed issue where auto-overriding components would write to wrong component
• Fixed issue with parsing template name in module
• Fixed assert during deferred component registration in multithreaded app
• Fixed leak in pipeline cleanup
• Fixed issues with sending valid preflight response in HTTP server
• Prevent sending response to invalid socket
• Don't call send on socket when reply has no data
• Fixed issue with setting symbol on entity with IsA relationship
• Fixed issue with observer that has multiple fixed sources
• Fixed escaping issue in doc strings in JSON serializer
• Fixed issue where serialized path of core entity was not relative to root
• Fixed HTTP socket leak, add timeout to connection socket
• Replaced incorrect cast to float to ecs_ftime_t in system addon
• Fixed issue with flecs::filter move assignment

This version includes the following improvements:

• [c++] Add support for run callback to C++ observers
• [c++] Add typed method for getting iterator ctx in C++ API
• [c++] Add support for run callback to C++ systems
• [c++] Add .term<R>(string) and .term(R, string) overloads to filter builder
• [c++] Add shorthand with/without methods to filter builder API
• [c++] Add pair support to emplace
• [c++] Add pair support for flecs::ref
• [c++] Ensure set, set_override use move for pairs where possible
• [journal] Implement journaling addin
• [queries] Improve performance of query rematching
• [filters] Allow for creation of named filters/rules
• [filters] Cache id record on filter terms for faster matching
• [rules] Enable overriding transitive behavior with self flag
• [observers] Refactor observer code for improved event propagation performance
• [observers] Implement reachable id cache to improve event performance of adding relationships
• [pipeline] Add doc name to pipeline schedule tracing
• [pipeline] Exclude systems from pipeline with disabled phase/disabled module
• [pipeline] Run single threaded systems on main thread
• [iterator] Add ecs_iter_first function
• [query DSL] Add query DSL support for specifying flags for (r, t) notation
• [commands] Reduce lookups during command batching (performance improvement)
• [storage] Reduce overhead of table graph edges, improve table creation speed
• [stats] Always use double for metric types to avoid precision issues
• [stats] Add REST and HTTP statistics
• [units] Add frequency units
• [rest] Add endpoint for requesting results of existing query
• [rest] Add endpoint for enabling/disabling entities
• [rest] Add caching for named query requests
• [rest] Start/stop HTTP servers when enabling/disabling REST module
• [http] Send HTTP headers in send thread
• [http] Improve response times and handling of HTTP preflight requests
• [http] Always use double precision for time values in HTTP server
• [doc] Add system examples
• [doc] Update C++ examples with simplified query variable syntax
• [doc] Add example to show how to forward declare component/tag variables
• [doc] Fix typos in manuals
• [doc] Add custom phase example that does not use builtin phases
• [doc] Remove outdated reference to ecs_scope_iter
• [doc] Replace flecs::entity with flecs::entity_t in C++ order_by example
• [doc] Improve pipeline section of manual
• [doc] Add observer examples for C/C++
• [ux] Improve error message for conflicting symbols during implicit component registration
• [build] Improve directory structure of cmake build to match visual studio
• [build] Improve bazel build to support .inl files
• [internals] Don't free chunks in flecs_sparse_clear (performance improvement)
• [internals] Use faster sparse set function in table event batching admin
• [internals] Replace map with faster sparse set in generic allocator
• [internals] Use faster storage for id records in low id range
• [internals] Inline type_info sparse set

Known issues:
#844
#765
#714
#620
#478
#314

Flecs v3.1.0

Release announcement

Flecs 3.1 is out!

Release notes

This version includes the following bugfixes:

• Fixed issue with terms that had Not operator in combination with relationship traversal
• Fixed issues in C++ API where component hooks could get reregistered across DLLs
• Fixed issue in queries with shared components and change detection
• Fixed issue in queries with fixed source terms and change detection
• Fixed issue in sparse set with bulk id generation and recycling
• Fixed issues with using emplace and commands
• Fixed issue in group_by example so it always returns alive entity identifier
• Fixed issue in pipeline with no_staging system after inactive system
• Fixed issue with instanced queries and nested iter calls
• Fixed issue where using observer with multiple components would crash when setting ctx and ctx_free
• Fixed issue where ecs_ref_t would do more lookups than necessary
• Fixed C++ issue with overriding a prefab child that was associated with a type
• Fixed missing call to move hook when moving entity in table
• Fixed double free for moved-away from component
• Fixed leak where world was not destroyed when using app::run
• Fixed table lock assert when adding component in observer during merge
• Fixed crash when OnRemove observer adds component to deleted entity
• Fixed issue with using ecs_add_path when path is root
• Fixed issue with assigning the same name to an entity after reparenting
• Fixed JSON crash on union pair with invalid target
• Fixed crash where no_staging system activated at end of schedule
• Fixed leak when multithreaded pipeline rebuilt after running the last system
• Fixed issue where HTTP server would write to memory of purged connection
• Fixed issue where observer would not restore iterator state for next observer
• Fixed issues with redefining addon macro's
• Fixed issues with parsing identifiers that start with _ in ECS_STRUCT
• Fixed issues with parsing pointer types in ECS_STRUCT

This version includes the following improvements:

• [c] Added ecs_children / ecs_children_next functions for iterating an entity's children
• [c++] Added entity_view::parent function (shorthand for target(flecs::ChildOf)
• [c++] Made calling world::module in module constructor optional
• [c++] Added each/iter overloads that accept a stage
• [c++] Allow module entity to be retrieved using world::entity / world::component
• [threading] Allowed using the world (vs. stage) in single threaded system running in multi threaded apps
• [commands] Command batching, which reduces archetype moves for entities when doing deferred operations
• [entity DSL] Improved syntax
• [entity DSL] Added entity DSL examples
• [entity DSL] Added support for multiline strings
• [entity DSL] Added support for anonymous entities
• [entity DSL] Added variable support (reusable values)
• [entity DSL] Added support for using simple arithmetic expressions
• [entity DSL] Implemented a vscode extension for DSL syntax highlighting
• [os api] Added function to get OS API struct (for easier support in language bindings)
• [queries] Added ability to add user-defined context to query groups
• [queries] Added assert on invalid usage of Filter in combination with queries
• [queries] Added ecs_query_next_table for fast iteration where only tables are needed
• [queries] Improved performance/cleanup technical debt of query change detection
• [queries] Added ecs_query_get_group_info function
• [observers] Added EcsFilter/flecs::Filter term flag for terms only for filtering, not receiving events
• [observers] Added level 3 trace that shows which observers are invoked
• [pipeline] Improved detection of sync points, correctly handle wildcard queries
• [pipeline] Always insert sync point after no_staging system to ensure schedule consistency
• [stats] Added FLECS_ACCURATE_COUNTERS for tracking allocation counters in multithreaded apps
• [stats] Added new statistics for allocators, events and performance tracking
• [stats] Organized statistics into categories
• [stats] Improved system time measurement so it no longer includes merge time
• [stats] Fixed issue where measuring system time for last part of schedule could be skipped
• [stats] Use 64bit counters to reduce occurrences of stat overflows
• [stats] Ensure counter metrics are monotonically increasing in case of overflow
• [rest] Added brief descriptions to stats endpoints for improved visualization in explorer
• [http] Don't enqueue requests for connections that are no longer alive
• [http] Don't keep HTTP connection open longer than timeout
• [http] Set timeout on connection receive socket
• [http] Set SO_KEEPALIVE on connection socket so server is notified when client drops connection
• [http] Implement send queue to prevent blocking on main thread when sending reply
• [http] Fixed issue with sending replies without payload
• [ux] Throw assert when component id overlaps with reserved bits for id flags
• [ux] Added typename to invalid ctor/dtor error messages
• [ux] Added assert when attempting to use ecs_bulk_init on stage
• [internals] Reduced number of heap allocations with internals now mostly using custom allocators
• [internals] Allow for overriding of ECS_HI_COMPONENT_ID macro
• [internals] Allow for overriding of ECS_ID_CACHE_SIZE macro
• [internals] Reduced bits reserved for id flags from 8 to 4
• [internals] Improved detection of platforms where execinfo/backtrace is not available
• [internals] Improved strbuf API so it relies less on strlen
• [internals] Improved performance of flecs_sparse_clear

Known issues:
#765
#714
#620
#478
#314

Flecs v3.0.4

This version includes the following bugfixes:

• Fixed issue where system created with each was not automatically instanced
• Fixed copy/paste error in term::read function that set the wrong inout kind
• Fixed issue that prevented deferring an emplace with types that had no default ctor
• Fixed issue that prevented on_add hook to be called for emplace
• Fixed issue where move_ctor wasn't called when merging deferred emplace
• Fixed issue where fps or thread count was overwritten when calling ecs_app_run
• Fixed issue where name prefix wasn't reset after bootstrap
• Fixed issue where union relationship wasn't properly initialized for prefab child
• Fixed various issues with using mingw
• Fixed wrong escaping of pipe symbol in documentation
• Fixed issues with enum reflection on clang and Windows
• Fixed issue with instantiating prefab children that are associated with root type
• Fixed issue where name lookup would fail after resetting name to NULL

This version includes the following improvements:

• Added constructor to flecs::query for creating named queries
• Rewrote outdated parts of "designing with flecs"
• Improved performance of ecs_count_id
• Improved performance of queries/observers that do relationship traversal
• Added query section to relationship manual
• Stats addon types now use customizable float type (ecs_float_t)
• Improved error message when using union relationship in C++ query signature
• Added overload for set_override where 1st element of pair is a tag
• Improved conversion logic of meta cursor API
• Improved documentation of ecs_new_id / ecs_new_low_id
• Updated outdated JSON examples
• Added entity::get_mut_second
• Improved performance of ecs_set

Known issues:
#765
#714
#620
#478
#314

Flecs v3.0.3

This version includes the following bugfixes:

• Fixed bug where constructor was not called for explicitly registered component in multi world C++ application
• Fixed bug with change detection and queries with OR terms

This version includes the following improvements:

• Fixed broken links and typos in documentation
• Added links to demos and blogs to README
• Remove redundant includes
• Remove redundant assignment in sparse set code
• New group_by example

This version includes the following new features:

• Group iterators (https://github.com/SanderMertens/flecs/tree/master/examples/cpp/queries/group_iter)

Breaking changes:

• Fixed inconsistencies in naming between fields and terms: #466 (comment)

Known issues:
#765
#716
#714
#620
#478
#314

Flecs v3.0.2

This version includes the following bugfixes:

• Fixed symbol export issues when using reflection convenience macro's like ECS_STRUCT
• Fixed bug that prevented inheriting from entities with a symbol identifier
• Fixed issue that could cause crash when creating tables with OVERRIDE or TOGGLE

This version includes the following improvements:

• Improved error messages when using stage outside of readonly context
• Several improvements that enable interop between C modules and C++
• Added more prefab examples
• DontInherit property is now respected when instantiating prefab children
• Transfer ownership of world to app framework in C++ so it can be used in webasm builds

This version includes the following new features:

• Added support for prefab slots (see https://github.com/SanderMertens/flecs/tree/master/examples/cpp/prefabs/slots)

Known issues:
#765
#716
#714
#620
#478
#314