Blender Git Loki

Material buttons now view the active node material shading settings.
Selecting a material in the node tree sets this as the active material and the buttons view redraws.

Added rna prop material.active_node_material

Currently its not clear what settings are used by the node material and the base material (needs some tedious research) so I made most panels use the node material with the exceptions of volumetrics, physics and halo settings.

We'll probably need to split the panels up to do this properly.