Brief:Implementing raycasting for dynamic buffergeometry
Summary:
BufferGeometry allows faster loading (direct buffer loading)
but not ray casting.  This adds that (if it is dynamic)
Merge remote-tracking branch 'kevinoe/BufferGeometryRaycast' into dev
Cleaned up Raycaster BufferGeometry implementation.
There are many allocations that would still need to be removed though.
Updated builds.