Fix: Add shortcut to rotate camera by 90degrees #14

[dk1242]

I have added a shortcut for rotating the camera by +/-90 degrees.
Pressing the key "4" will rotate the camera by -90 degrees and "6" will rotate it by 90 degrees.

Fixes for #14

[github-actions]

You are modifying libf3d public API! ⚠️Please update bindings accordingly⚠️!
You can find them in their respective directories: python, java, webassembly.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.85%. Comparing base (fe2e432) to head (f3781c4).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1634   +/-   ##
=======================================
  Coverage   96.84%   96.85%           
=======================================
  Files         108      108           
  Lines        7671     7683   +12     
=======================================
+ Hits         7429     7441   +12     
  Misses        242      242           

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[mwestphal]

looks nice! Please also add doc for this feature in:

• vtkF3DRenderer::ConfigureCheatSheet
• doc/user/INTERACTIONS.md