This is the heap representing system memory. The memory type
corresponding to `MTLStorageModeShared` is reported as belonging to this
heap.
I've tried to correct the reported size of the heaps as well while I'm
at it. UMA GPUs and the system heap for NUMA GPUs use the system memory
size as the heap size, and the amount of available memory as the budget.
iOS 13 uses the new `os_proc_available_memory()` API for this purpose.
NUMA GPUs additionally use the memory used by the process as a crude
measure of system heap usage.
Add MVKDebugReportCallback class.
Add MVKVulkanAPIObject class as base class of classes exposed in Vulkan API.
Remove MVKRefCountedDeviceObject class and move ref-counting to MVKVulkanAPIObject.
Rename MVKDispatchableObject class to MVKDispatchableVulkanAPIObject.
Introduce multiple inheritance mixin classes into class hierarchy.
Add MVKBaseObject::getVulkanAPIObject() function to find Vulkan API object
controlling any subobject that needs to report something.
MVKCommandResourceFactory functions pass in calling object for reporting.
Add MVKBaseObject::reportMessage() & reportError() functions.
Replace mvkNotifyErrorWithText() static function with reportError()
instance function to allow access to debug reporting.
Redefine MVKLog*() functions to call reportError() instance method.
Delete MVKLogging.cpp.
Remove MVKLogging.h from MoltenVKShaderConverter project.
Add mvk_datatypes.hpp to redirect errors in mvk_datatypes.h functions to debug
reporting. Use mvk_datatypes.hpp internally for all references to these functions.
Convert several static methods to instance methods.
Refactor platform defines in MVKSurface.h.
Explicitly count MVKExtensionList extension count to avoid relying on struct size.
Remove MVKCommandBuffer::recordResult() and use setConfigurationResult().
Change log indication of error in logs from [***MoltenVK ERROR***] to [mvk-error],
for consistency with other log level indications.
Update MoltenVK version to 1.0.35.
