Respect hidden flag on Windows

[Icxolu]

This PR adds the functionality to ignore hidden and system files on Windows.

• hidden files can be shown by --all and --almost-all
• system files can be shown using new cli flag --system-protected
• --system-protected behaves the same as --all on non-Windows platforms
• --system-protected is hidden from the help on non-Windows platforms, since it has no added value there

Fixes #752

---

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)

[zwpaper]

hi @Icxolu thanks for contributing!

[codecov-commenter]

Codecov Report

Merging #766 (e25a120) into master (f014138) will decrease coverage by 0.12%.
The diff coverage is 60.86%.

@@            Coverage Diff             @@
##           master     #766      +/-   ##
==========================================
- Coverage   86.78%   86.66%   -0.13%     
==========================================
  Files          43       44       +1     
  Lines        4313     4333      +20     
==========================================
+ Hits         3743     3755      +12     
- Misses        570      578       +8     

Impacted Files	Coverage Δ
src/main.rs	26.31% <ø> (ø)
src/meta/windows_utils.rs	0.00% <0.00%> (ø)
src/meta/mod.rs	43.47% <63.63%> (+1.17%)	⬆️
src/flags/display.rs	98.11% <85.71%> (-1.89%)	⬇️
src/app.rs	75.71% <100.00%> (+0.35%)	⬆️

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[meain]

Looks like the CI is failing because we need a newer version of Rust. Feel free to bump up the version. You can see a similar commit here. Looks good to me otherwise. :D

[Icxolu]

I bumped the minimum rust version to 1.64. This should make CI happy again.

[meain]

Thanks for the PR