* Use correct aspect masks for stencil-only textures
* Make vkEnumerateInstanceVersion optional
This makes init not abort on Vulkan 1.0
* Move swapchain into FrameBufferVK
* Remove duplicate render pass creation code
* Manually resolve MSAA backbuffer
not guaranteed to be supported, but reduces resolve operations from 2 * (num views using backbuffer) to 1
* Support for multiple windows (BGFX_CAPS_SWAP_CHAIN)
* Capture support (BGFX_RESET_CAPTURE)
* Display present timings
* Recreate surface if native window handle changed
* Delayed swapchain deletion on resize
no more vkDeviceWaitIdle
* Recreate surface if BGFX_RESET_HIDPI is toggled
* Don't recreate swapchain if only the MSAA sample count changed
* Some extra caps checks
* Configurable backbuffer depth format
* Configurable backbuffer color format
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