Unreal_Toolkit: Understanding material extraction from Rhino (RH->BHoM connection)

Aim: get Rhino material information in Grasshopper, per layer/per object.

Plan should be to somehow deconstruct the material assignment in Rhino and elaborate that information in Grasshopper, so we can export it to Unreal through the BHoM.

Whether to include the material in the BHoM as properties of the VR mesh object, or to find another way to export it to Unreal should be targeted later (#25).

Example to follow can be Human plugin or similar.