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So e.g. NoVSync can give the maximal performance.

and fix isFeatureSupported(DebugMarkers) logic

and fix Vulkan frame time calculation when timePeriod != 1.

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

Every 120 frames atm. This becomes more interesting once
timestamp queries are implemented...

...and do some naming cleanup (currentFrame -> currentFrameSlot).

try to deal with the nonsense feature set api

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.