Release for Vulkan SDK 1.2.135

• Accurately populate Vulkan VkFormatProperties from MTLPixelFormat capabilities,
  taking into consideration variations across MTLDevice Features Sets.
• Validate format capabilities for MSAA, renderpass attachments, and vkCmdResolveImage().
• Fix issue where immutable samplers are removed during descriptor update.
• Guard against Metal validation assertion from reuse of query number within a single MTLRenderEncoder.
• Increase value of VkPhysicalDeviceLimits::minStorageBufferOffsetAlignment
  to 16 to avoid Metal validation assertions.
• Add ability to disable command memory pooling using MVK_CONFIG_USE_COMMAND_POOLING
  environment variable.
• Fix memory leak when pre-filling MTLCommandBuffers using MVK_CONFIG_PREFILL_METAL_COMMAND_BUFFERS.
• Fix issue causing screen captures from swapchain image to deadlock.
• Fix memory estimates for iOS 13+.
• Broaden conditions for host read sync for image memory barriers on macOS.
• Fix issue of reseting CAMetalDrawable and MTLTexture of peer swapchain images.
• Fix the make install build command to overwrite the existing framework in the system
  framework library, and update README.md to clarify the instructions for using make install.
• Update the README.md and MoltenVK_Runtime_UserGuide.md documents to clarify that
  MoltenVK is not a fully-compliant implementation of Vulkan.
• Support Xcode 11.4.
• Disable API-Samples demos and document in Demos/README.md.
• Update dependency libraries to match Vulkan SDK 1.2.135.
• Update to latest SPIRV-Cross version:
  • MSL: Support inline uniform blocks in argument buffers.
  • MSL: Move inline uniform blocks to the end of the argument buffer.
  • MSL: Fix access chain for deep struct hierarchy on array of buffers.
  • MSL: Remove old memory_scope flag from iOS barriers.
  • MSL: Fixes to array handling.