Add suport for mouse event modifiers in occt_widget (Shift/Ctrl + Left Mouse Button)

[manuels]

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 88.59%. Comparing base (4b461fe) to head (0dac696).
Report is 29 commits behind head on master.

Files	Patch %	Lines
cq_editor/widgets/occt_widget.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #355   +/-   ##
=======================================
  Coverage   88.59%   88.59%           
=======================================
  Files          19       19           
  Lines        1490     1490           
  Branches      204      204           
=======================================
  Hits         1320     1320           
  Misses        137      137           
  Partials       33       33           

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