Automatically Adjust Detector Update Rate

[Valkryst]

Though detectors should make an effort to respect the updatesPerSecond value passed to their start function, it is entirely possible that the user's device cannot run as fast as the developer requests. In these cases, we could use the StatRecorder class to keep track of the average runtime and adjust the update rate as necessary.

We never want to run faster than the specified updatesPerSecond, but it is acceptable to run more slowly.