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

[manuels]

[codecov[bot]]

Codecov Report

Merging #355 (0dac696) into master (4b461fe) will not change coverage. The diff coverage is 0.00%.

@@           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           

Impacted Files	Coverage Δ
cq_editor/widgets/occt_widget.py	78.94% <0.00%> (ø)

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