Fix showing every file as executable on Windows

[Icxolu]

This PR determines the executable state of a file on Windows using the file extension instead of permissions.
This fixes that every regular file was marked executable (green).

• added --exec-ext <ext> to change mark extensions as executable on the fly
• added executable-extensions config to modify them more permantly LS_COLORS can be used to customize (other) extentions
• cli flags and config file options will be merged
• exe, msi, cmd and ps1 will be marked as executable on windows

Fixes #712

---

TODO

• Use cargo fmt
• Add necessary tests
• Add changelog entry
• Update default config/theme in README (if applicable)
• Update man page at lsd/doc/lsd.md (if applicable)

[meain]

I like the idea of having predefined file extensions being marked as executable. I don't think we should have an option to configure it though. If they want to add more file extensions to be marked as green, one can always control it with LS_COLORS(or PR to upstream if it is really common). Could you rework it so that we don't have a new cli flag or config option?

[Icxolu]

I dropped the configuration option and cli flag. I was not really happy with them either, it felt like a little too much, but i haven't thought of just using LS_COLORS as the customizable option. For now i marked exe, msi, bat and ps1 as executable.

[Icxolu]

With this in place, we could probably also revisit fetching ACL permission only on demand, since we don't use any other Permission info for coloring. This could potentially improve performance on (domain connected) Windows machines significantly. As a replacement, we could introduce a Mode block, like PowerShell does, which displays the file attributes.

[meain]

Looks good. Add a test for verifying this behavior on windows and we should be good to go. :D

[meain]

Nit, we can change this to #[cfg(not(windows))].

[Icxolu]

done 😇

[codecov-commenter]

Codecov Report

Merging #769 (f42409e) into master (f5ee0a2) will decrease coverage by 0.07%.
The diff coverage is 11.11%.

@@            Coverage Diff             @@
##           master     #769      +/-   ##
==========================================
- Coverage   86.68%   86.60%   -0.08%     
==========================================
  Files          44       44              
  Lines        4332     4336       +4     
==========================================
  Hits         3755     3755              
- Misses        577      581       +4     

Impacted Files	Coverage Δ
src/meta/mod.rs	43.16% <0.00%> (-0.32%)	⬇️
src/meta/permissions.rs	92.56% <ø> (ø)
src/meta/filetype.rs	80.55% <12.50%> (-2.31%)	⬇️
src/theme/icon.rs	100.00% <0.00%> (ø)

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