Implement Speed Governing data

Add "rate" parameter to MasterClock and ClockManager

Fix additional problems with time systems
* MasterClock was always setting delta to 0.1, when it shouldn't be possible to drop beneath 16.7.
* Game now updates MasterClock when changing the frameRate.
* Game now has a framerate range of 0 < framerate. It was previously 0 <= framerate <= 60.