✨ Support Posix Paths

[Zethson]

• Adds support for posix Paths for ReadFCS
• Updates lots of old code infrastructure and fixes some docstrings

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.

Project coverage is 90.29%. Comparing base (10e9167) to head (452f4c8).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
readfcs/datasets/_datasets.py	33.33%	2 Missing ⚠️
readfcs/_core.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   89.23%   90.29%   +1.06%     
==========================================
  Files           4        4              
  Lines         130      134       +4     
==========================================
+ Hits          116      121       +5     
+ Misses         14       13       -1     

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