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/PartDesign/Gui/ViewProviderDatum.cpp

@@ -85,7 +85,7 @@ ViewProviderDatum::ViewProviderDatum()
     unsigned long shcol = hGrp->GetUnsigned ( "DefaultDatumColor", 0xFFD70099 );
 
     App::Color col ( (uint32_t) shcol );
-    ShapeColor.setValue ( col );
+    ShapeAppearance.setDiffuseColor(col);
 
     Transparency.setValue (col.a * 100);