develop

[yaugenst]

• fix examples (fix examples #15)
• Remove all
• Fix remaining lint errors, FEA is now dataclass, element properties can be specified in FEA classes
• Fix mypy error
• Always run tests, and add mypy type checking
• Add some very basic tests for elements
• Add some basic tests for fea2d
• Use cache action to cache pip on all OS's
• Use new cache syntax
• Fix jobs not running on all OS's
• Add shell argument

[codecov]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (a312ddd) 24.53% compared to head (895d40a) 80.00%.

Files	Patch %	Lines
tofea/fea2d.py	76.47%	12 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #16       +/-   ##
===========================================
+ Coverage   24.53%   80.00%   +55.46%     
===========================================
  Files           6        5        -1     
  Lines         216      220        +4     
===========================================
+ Hits           53      176      +123     
+ Misses        163       44      -119     

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