Add timing arguments to the onFrame callback

[snagy]

This change adds a frame time and delta time to the onFrame callback, to encourage framerate-independent animation.

It just passes through the time counter received from requestAnimationFrame. It's possible we'd want to switch this to the three.js Clock, but that raises complexity to properly create a single clock and update all the frame listeners properly.

I also added an example that uses these values to animate a camera and cube.

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[DefinitelyMaybe]

oh hell yeah! this is one of those things I was thinking about too.

One of the first things I noticed was "oh! canvas resizing is already done for you. win." and later on down the track, I was like "what about animation/timing/framerates"

Good stuff 👍

edit: omgosh that cube is so cool