returns a quantised version of millis that can give the effect of an apparent different frame rate to whatever it's applied to (perhaps for stop motion).
Parameters
apparentFrameRate: number
e.g. 10 would mean the returned millis value would be quantised to 100ms intervals (1000/10).
It's probably better to mod this function to have it draw upon a config.apparentFrameRate for global stop motion effects and simpler-looking code.
returns a quantised version of millis that can give the effect of an apparent different frame rate to whatever it's applied to (perhaps for stop motion).