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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

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.

not yet implemented

...in a console app.

...and fix the license headers while we are at it.