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...and related plumbing here and there.

This reverts commit 2676ad23.

Now passing --metallib (or -t) to qsb will transparently generate
a metallib binary, storing that instead of the MSL source. The rhi
backend picks it then up automatically, when present.

...and so using pre-compiled byecode transparently to the applications.

The rest should follow suit later.

also add a leftover file from the last patch.

No other way.

Doing an update to a texture or an immutable or static buffer in
two consecutive frames was problematic since we touched the data
for a buffer that was potentially read by the GPU.

This also simplifies since the staging buffer and allocation can go
through the same deferred release queue like everything else.

Behold the textured cube!

...instead of ChangeInfrequently. This way the common case
(not changing the image data afterwards) is the default.