get icon from any assets folder

[trappitsch]

Icons can now live in any folder named assets, no matter where. This is useful for programs, where we want to package the icon along with the python package and use the same icon for the executable and the package. How to do this is also noted in the docs.

Updated changelog.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.76%. Comparing base (64e5a8f) to head (6d1497c).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #50   +/-   ##
=======================================
  Coverage   99.76%   99.76%           
=======================================
  Files          25       25           
  Lines        1669     1707   +38     
=======================================
+ Hits         1665     1703   +38     
  Misses          4        4           

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