Numerous enhancements and fixes

• Replace use of std::vector with MVKVector to support allocations on stack.
• Add missing include MVKEnvironment.h to MVKImage.mm for IOSurfaces.
• vkCmdClearAttachments apply [[render_target_array_index]] more carefully.
• vkCmdPushDescriptorSet: Fix mapping of binding numbers to descriptor layouts.
• Forbid depth/stencil formats on anything but 2D images.
• MVKCommandPool: Destroy transfer images using the device.
• MVKPipeline: Reject non-multiple-of-4 vertex buffer strides.
• MVKPipeline: Set auxiliary buffer offsets once, on layout creation.
• MVKSampler: Support border colors.
• MVKImage: Round up byte alignment to the nearest power of 2.
• MVKImage: Don't set MTLTextureUsageRenderTarget for non-blittable formats.
• MVKImage: Support image views of 2D multisample array images.
• MVKGraphicsPipeline: Add dummy attachments even when rasterization is off.
• MVKDeviceMemory: Try creating an MTLBuffer before allocating heap memory.
• Add support for VK_FORMAT_A2R10G10B10_UNORM_PACK32.
• Support A8B8G8R8_PACK32 formats.
• Add new formats and fix existing ones.
• On macOS, VK_FORMAT_E5B9G9R9_UFLOAT_PACK32 can only be filtered.
• On macOS, linear textures cannot be blitted to.
• Depth formats cannot be used for a VkBufferView.
• Give every image format we support the BLIT_SRC feature.
• Correct supported features of compressed formats.
• Correct mapping of packed 16-bit formats.
• Add some more vertex formats.
• Don't use char/uchar for clearing/copying 8-bit formats.
• Explicitly set number of sparse image property/requirement info sets to 0.
• Retrieve linear image memory alignment requirements from Metal device.
• For each GPU, log MSL version and updated list of feature sets.
• Cube demo on iOS support Portrait and Landscape device orientation.
• Build the dylib with -fsanitize=address when asan is enabled.
• Fix name of generated dSYM file.
• Update to latest SPIRV-Cross version:
  • MSL don't emit memory_scope after MSL 2.0.