Add support for extension VK_KHR_synchronization2.
- MVKPhysicalDevice add support for VkPhysicalDeviceSynchronization2Features.
- Pass sync2 structs to MVKPipelineBarrier, MVKCmdPipelineBarrier, MVKCmdSetEvent,
MVKCmdResetEvent, MVKCmdWaitEvents, MVKRenderPass, MVKQueue & MVKQueueSubmission.
- Replace use of VkPipelineStageFlags & VkAccessFlags
with VkPipelineStageFlags2 & VkAccessFlags2.
- Add stage masks to MVKPipelineBarrier, and redefine apply*MemoryBarrier()
functions to remove separately passing stage masks.
- Add MVKSemaphoreSubmitInfo to track semaphores in MVKQueueSubmission.
- Add MVKCommandBufferSubmitInfo to track command buffers
in MVKQueueCommandBufferSubmission.
- Add MVKSubpassDependency to combine VkSubpassDependency & VkMemoryBarrier2 in MVKRenderPass.
- Remove abstract MVKCmdSetResetEvent superclass.
- Streamline code in MVKMTLFunction::operator= (unrelated).
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