Release v20.0.0: Saving/Loading using pyobjson, Codebase Refactor/Lint, New Run Flow

Release Notes

• Upgraded saving/loading data to use pyobjson
• Refactored entire codebase into subdirectory and reorganized/renamed some modules
• Upgraded to uv/ruff
• Linted codebase with ruff and bandit
• Addressed technincal debt
• Improved logging
• Cleaned up some runtime business logic
• Generalized some feature business logic
• Created a universal feature data spec with normalized player key
• Addressed some TODOs
• Updated main.py run flow
• Updated command line arguments
• Updated documentation
• Updated dependencies