Package clock manages game timers.
const UncappedTPS = -1
Update updates the inner clock state and returns an integer value indicating how many times the game should update based on given tps. tps represents TPS (ticks per second). If tps is UncappedTPS, Update always returns 1. If tps <= 0 and not UncappedTPS, Update always returns 0.
Update is expected to be called per frame.