OpenXR - Major review

[lvonasek]

• Update of OpenXR runtimes to the latest (headset vendors bug fixes, smaller APK)
• Optimize critical OpenXR code sections (reduces lagging)
• Reverts workaround for PicoOS 5.3 (necessary to finish multiview or vulkan support)
• Wrong view mirroring causing random glitches (Gran Turismo, Nascar, Flatout, etc.)

This fixes #16175 (in the issue were more bugs at the same time, the non-VR issues were already fixed by Unknown)

[hrydgard]

I'm okay with this, but I'm curious what the purpose is for the depth swapchain. Doesn't feel like one should be needed unless you want to integrate depth-wise with other running apps somehow - we don't output much depth anyway to the backbuffer.

[lvonasek]

I'm okay with this, but I'm curious what the purpose is for the depth swapchain. Doesn't feel like one should be needed unless you want to integrate depth-wise with other running apps somehow - we don't output much depth anyway to the backbuffer.

It is easier way to initialize depth and stencil attachments for framebuffer. The same code for every renderer.