Baking: add modes Attribute, Color Attribute and Coat Tint

[franMarz]

Create Attribute and Color Attribute (or Attribute Color) and Coat Tint baking modes. Pay attention to the default color spaces.

Maybe the duplication of the active layer and renaming of the duplicate as 'TexTools_temp' is needed.

Consider removing some modes as a consequence of these additions, or because of them being already deprecated due to the latest changes in the Principled BSDF.