Material: Material appearance

Uses new material system for appearance

Each feature object now has a property called ShapeMaterial that
describes its physical properties. If it has a shape, it has a
material.

The ShapeColor attribute is replaced by a ShapeAppearance attribute.
This is a material list that describes all appearance properties, not
just diffuse color. As a list in can be used for all elements of a
shape, such as edges and faces.

A new widget is provided to allow the user to select materials in a
consistent fashion. It can also launch the material editor with its
more advanced capabilities.

src/Mod/Fem/Gui/ViewProviderFemConstraint.cpp

@@ -59,7 +59,6 @@ ViewProviderFemConstraint::ViewProviderFemConstraint()
 {
     ADD_PROPERTY(TextColor, (0.0f, 0.0f, 0.0f));
     ADD_PROPERTY(FaceColor, (1.0f, 0.0f, 0.2f));
-    ADD_PROPERTY(ShapeColor, (1.0f, 0.0f, 0.2f));
     ADD_PROPERTY(FontSize, (18));
     ADD_PROPERTY(DistFactor, (1.0));
     ADD_PROPERTY(Mirror, (false));