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...and fix up the whole res update system for d3d and gl. (make it
go through the (fake) command buffer like everything else)

hints -> flags for rt, add sampleCount for tex

...for non-compressed textures.

Color only, one subres at a time, transitions between transfer and
shader-read every time. For the common cases this is good enough,
to be explored later if it could be made smarter.

...in order to make the api nicer. Does not affect the internals.

With an example.

This is not as good as other backends when it comes to formats,
but the gl backend is lacking in that area anyways.

Merge initial readback/offscreen stuff

See merge request laagocs/qtrhi!1

not yet implemented

...in a console app.

only implemented for Vulkan for now

...and related plumbing here and there.