GpuBuffer obsoletes ComputeBuffer to prevent confusion that it's compute exclusive * Non templated version because sometimes your buffer will have various types * Usage flags can be combined now, e.g a buffer can be used as an IndexBuffer but also ByteAddress for compute shader * Added additional error checking, exposed readonly properties for count/size/usage * Added CodeUpgrader for ComputeBuffer -> GpuBuffer * Fix Terrain materials buffer overflowing its gpu buffer