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Sharable resources, which are at least buffers and textures, can now be
orphaned, meaning the owning QRhi can be destroyed before releasing the
QRhiResource. They will still function in a limited way (cannot be rebuilt
anymore) as long as there is at least one QRhi associated with the
QRhiResourceSharingHost (i.e. as long as the share group is non-empty).

The threaded case cannot be supported on all backends for now.
Revert parts of the previous d3d patch.

Some day we may consider exploring the possibility of doing something
with deferred contexts on d3d11 but that's not an option for now.

Won't yet work, obviously.

...and mark the first round of doc work as done, yay

...and play with capture scopes as well. None of this will eliminate
the nextDrawable Called Early warning and the strangely-ordered frame
navigator view in XCode which is annoying but there is nothing we can
do about it.

...because we only really need to make sure arg changes are not skipped
upon a new pass, just changing the pipeline state has no effect on this.

Clarify the docs a bit as well.

Esp. for Metal where we now avoid superfluous set* for shader
resources.

...also write more sophisticated output in the profiler
stream when it comes to frame timings.

try to deal with the nonsense feature set api