Fix barriers for clear UAVs

Allow sharing descriptor heaps

Fix the calls of pipeline interfaces

Update README.md

Fix the wrong barrier number in buffer read back

Fix samplers for root sig 1.1 in EZ

1. Fix error interpretation for D3DX12SerializeVersionedRootSignature
2. Fix samplers for root signature 1.1 in EZ

Fix the descriptor table lib

Update XUSGRayTracing-EZ.cpp

Add normalization ops