This refactors DressUp VP a bit so it does no longer store original copy
of original faces colors to properly support selection, but uses
highlight methods provided by the base class. It simplfies code a bit
and ensures coherent behavior.
Improves the use of the ShapeAppearance property for the Part workbench.
removes DiffuseColor property
adds Python compatibility using custom attributes
transitions DiffuseColor to ShapeAppearance on open
Improved UI elements for setting object appearance, and appearance per face
Lays the foundation for future texture support
Also remove unused headers and fix spacing.
A final fixup for issues addressed in:
cb05b01 PartDesign/TaskDressUpParameters: fix a crash when editing a broken object
