Move coloring info logic into a dedicated handler

[mwestphal]

• Move ColoringInfo logic out of vtkF3DMetaImporter and vtkF3DRenderer into a dedicated F3DColoringInfoHandler
• F3DColoringInfoHandler contains ColoringInfo maps as well as current coloring state
• F3DColoringInfoHandler is owned by the meta importer and accessed by the renderer
• Change the API in vtkF3DRenderer
• vtkF3DRenderer now handles arrayName and EnableColoring as standard properties
• Inform user when coloring is forced
• Fix small issues in vtkF3DRenderer with log and coverage
• Add/Update tests
• Update docs
• Fix Volume Rendering require coloring array to be set to work correctly #1651

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.95%. Comparing base (e4cf9fe) to head (4cd6b3b).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1672      +/-   ##
==========================================
- Coverage   97.01%   96.95%   -0.06%     
==========================================
  Files         105      106       +1     
  Lines        7935     8612     +677     
==========================================
+ Hits         7698     8350     +652     
- Misses        237      262      +25     

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