Explicitly mark home directories as having a posix or windows flavor

[twiggler]

• Explicitly mark home directories as either posix_path or windows_path
• Add missing unit test for parsing of users on windows and unix

Closes #891

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.44%. Comparing base (76dfe96) to head (932a86b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #892   +/-   ##
=======================================
  Coverage   76.44%   76.44%           
=======================================
  Files         314      314           
  Lines       26928    26930    +2     
=======================================
+ Hits        20585    20587    +2     
  Misses       6343     6343           

Flag	Coverage Δ
unittests	76.44% <100.00%> (+<0.01%)	⬆️

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[Schamper]

Only small question, looks good otherwise.

[Schamper]

If you make the title slightly more descriptive this looks good to me!