Add new palette backgrounds and reorganize the palette combo box

Yohann Bearzi (Kitware)requested to merge
yohann.bearzi/paraview:new-palette-backgrounds into master

This commit introduces new palette backgrounds:

  • Warm Gray Background
  • Neutral Gray Background
  • Light Gray Background

Gray Background is renamed Blue Gray Background

Default Background and Print Background are removed from the combo box for selecting palette backgrounds, as they are duplicates of Blue Gray Background and White Background respectively.

Backward compatibility is implemented for LoadPalette in python for DefaultBackground, GrayBackground, and PrintBackground.

Fixes #20707 (closed)

Edited by Yohann Bearzi (Kitware)

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