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In particular the relation_flags indicate whether the pose is valid or a fallback pose.

ensure_valid_position_and_orientation() inserts fallback poses when
driver reported poses are invalid.

st/oxr: Don't indiscriminately set orientation & position to valid in ensure_valid_position_and_orientation()

Hook up layer rendering when XRT_FEATURE_SERVICE is not set.

Skip rendering when swapchains are invalid.

Make the renderer and IPC aware of multiple projection and quad layers
using the layer renderer.

Remove redundant code related to idle images and imported buffers and
command buffer rebuild, since we now always just display the layer
renderer's frame buffer.

Get view and projection properties from xrt_device.

Implements a layer renderer capable of handling multiple quad
and projection layers rendered in it's own Vulkan pipeline.

Fixes an validation issue on NVIDIA and should bring more performance.

We already have a SurviveSimpleObject, no need to look for it through iteration

st/oxr: Write out pose values on failure, better say which layer failed and also check projection layer poses

Correctly validate quaternion using non-squard "length" instead of squard
"length", certain combinations of elements would produce valid regular "length"
but not valid squard ones.