Use per-second instead of per-tick times

[nabijaczleweli]

Closes #63

[TheCatPlusPlus]

The problem with this is that the framerate is not guaranteed to be constant, hence why requestAnimationFrame callback gives you a timestamp and why the stub had a delta calculation which was supposed to be used for this. The server needs something like that, too. Multiplying real time values by a constant is only really valid when time step is fixed (but you still need real time deltas to know how many times to update physics in a frame), otherwise they should be multiplied by the real time delta.

[nabijaczleweli]

I guess timestamps in Game.frame are respected now?
If that's not it I'm not quite sure what you're on about.