Backface Culling Additions

[KeflerExe]

Added "SetBackfaceCulling()" at "vtkF3DRenderer::ConfigureActorsProperties()". Added "BackfaceCullingVisible" in class "vtkF3DRenderer". Added CheatSheet text at "vtkF3DRenderer::FillCheatSheetHotkeys" for backface culling.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 73.33333% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 96.51%. Comparing base (a85b2c4) to head (e0ef584). Report is 4 commits behind head on master.

Files	Patch %	Lines
vtkext/private/module/vtkF3DRenderer.cxx	63.63%	4 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1421      +/-   ##
==========================================
- Coverage   96.55%   96.51%   -0.05%     
==========================================
  Files         103      103              
  Lines        7555     7570      +15     
==========================================
+ Hits         7295     7306      +11     
- Misses        260      264       +4     

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[mwestphal]

hey @KeflerExe

I'll take this over if that's okay.

[mwestphal]

https://github.com/f3d-app/f3d/pull/1480