* Add a sampler pool cache and improve texture pool cache
* Increase disposal timestamp delta more to be on the safe side
* Nits
* Use abstract class for PoolCache, remove factory callback
* Make GPU memory manager a member of GPU channel
* Move physical memory instance to the memory manager, and the caches to the physical memory
* PR feedback
* Ground work for separate GPU channels
* Rename TextureManager to TextureCache
* Decouple texture bindings management from the texture cache
* Rename BufferManager to BufferCache
* Decouple buffer bindings management from the buffer cache
* More comments and proper disposal
* PR feedback
* Force host state update on channel switch
* Typo
* PR feedback
* Missing using
