Refacto: move GUI related code in a separate module and adapt setuptools

[Guts]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 46 lines in your changes are missing coverage. Please review.

Project coverage is 20.42%. Comparing base (a9decce) to head (472b3cc).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #232      +/-   ##
==========================================
- Coverage   20.71%   20.42%   -0.29%     
==========================================
  Files          37       38       +1     
  Lines        3032     3075      +43     
  Branches      310      317       +7     
==========================================
  Hits          628      628              
- Misses       2372     2415      +43     
  Partials       32       32              

Flag	Coverage Δ
unittests	20.42% <0.00%> (-0.29%)	⬇️

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Files	Coverage Δ
dicogis/ui/main_windows.py	0.00% <ø> (ø)
dicogis/cli/main.py	0.00% <0.00%> (ø)
dicogis/ui/main.py	0.00% <0.00%> (ø)