RHi now provides CreateAndLock functions for Vertex and Index buffers which are more efficient on certain platforms.
Use r.PS4StandardWriteLocks=1 to enable the old default functionality for testing if necessary.
#codereview Gil.Grib,Lee.Clark
[CL 2606146 by Marcus Wassmer 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]
