- MVKResource::getHostMemoryAddress() return nullptr if
MVKDeviceMemory::getHostMemoryAddress() returns null pointer,
regardless of local offset.
- Remove unnecessary enum value kMVKVkFormatFeatureFlagsTexTransfer
to reduce redundancy between read and transfer feature flag options.
- Fix spelling of mvkVkOffset3DFromMTLOrigin() (unrelated).
- MVKResource remove unnecessary inline qualifiers (unrelated).
- MVKDevice remove some obsolete commentary (unrelated).