Project and CI changes

[RalfG]

Changed

• Switch to setuptools
• Lint with Ruff
• Attempt to fix codecov

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.18%. Comparing base (0fbbe36) to head (1517d36).

Additional details and impacted files

@@            Coverage Diff             @@
##            main      #78       +/-   ##
==========================================
+ Coverage   0.00%   63.18%   +63.18%     
==========================================
  Files         25       25               
  Lines       2415     2415               
==========================================
+ Hits           0     1526     +1526     
+ Misses      2415      889     -1526     

Flag	Coverage Δ
unittests	63.18% <ø> (?)

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