Removed macro D3D12MA_OPTIONS16_SUPPORTED from the public interface

Also removed it from the Cmake script. It is now automatically determined based on D3D12_SDK_VERSION macro.
Also made fixes in tests.
Cherry-picked from branch "feature/resource-tight-alignment".

Author: adam-sawicki-a

include/D3D12MemAlloc.h

@@ -1123,8 +1123,6 @@ class D3D12MA_API Allocator : public IUnknownImpl
     When true, you can use `D3D12_HEAP_TYPE_GPU_UPLOAD`.
 
     This flag is fetched from `D3D12_FEATURE_D3D12_OPTIONS16::GPUUploadHeapSupported`.
-
-    `#define D3D12MA_OPTIONS16_SUPPORTED 1` is needed for the compilation of this library. Otherwise the flag is always false.
     */
     BOOL IsGPUUploadHeapSupported() const;
     /** \brief Returns total amount of memory of specific segment group, in bytes.