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/Part/Gui/ViewProviderProjectOnSurface.cpp

@@ -42,7 +42,7 @@ ViewProviderProjectOnSurface::ViewProviderProjectOnSurface()
 {
     const unsigned int color = 0x8ae23400;
     LineColor.setValue(color);
-    ShapeColor.setValue(color);
+    ShapeAppearance.setDiffuseColor(color);
     PointColor.setValue(color);
     Transparency.setValue(0);
 }