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Exercised in examplewindow. (run plainqwindow_metal in XCode)

Exercise in trianglerenderer

Plus add timestamps and rename setOutputDevice to setDevice.

Only complete for Metal atm.

The real nice part here is the inclusion of some additional calculations
(like approximate byte size for textures and such).

plus rework it a bit for metal

Implement texture stuff for Metal for now, and exercise
it in texuploads.

...and add the skeleton of our integration class.

Clears the buffers at least.

long way to go