Tweak MTL type declarations in metal-cpp.h
Tweak MTL type declarations in metal-cpp.h

Changes to make metal-cpp options work nicely with RenderDoc serialization
_MTL_OPTIONS -> _NS_ENUM

RenderDoc serialization works with fixed sized types

baldurk/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,baldurk/renderdoc,baldurk/renderdoc,Zorro666/renderdoc,baldurk/renderdoc,baldurk/renderdoc