This is a non-functional code-maintenance change.
Previously, MVKDevice contained a significant amount of publicly exposed
internal content. This patch adds functions to MVKDeviceTrackingMixin to
better encapsulate, consolidate & streamline access to this content.
- Make MVKDeviceTrackingMixin a friend of MVKDevice & MVKPhysicalDevice.
- Hide public MVKDevice content behind MVKDeviceTrackingMixin functions.
- Remove similar MVKDevice content pointers from MVKCommandEncoder.
- MVKDevice remove getPhysicalDevice(), getPixelFormats() & getMTLDevice(),
to focus access through MVKDeviceTrackingMixin.
- Move performance tracking functions to MVKDeviceTrackingMixin to remove
need to reference MVKDevice multiple times when marking performance values.
- Subclass MVKQueueSubmission, MVKMetalCompiler, MVKShaderLibrary, and
MVKShaderLibraryCache from MVKBaseDeviceObject to make use of these changes.
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