ADDED thumbnail renderer for GeometryCache
ADDED BP creation from GeometryCache asset
ADDED de-registering of handlers during GeomCacheModule shutdown
FIXED bug with importing Materials, though recreating a clean scene in Maya also fixed it (bad Maya history)
[CL 2682433 by Jurre DeBaare in Main branch]
ADDED Support for importing GeometryCache assets from Alembic files
ADDED CalculateRawMeshTangets function that only calculates the tangents without building the RawMesh
[CL 2591762 by Jurre DeBaare in Main branch]