Looks like we want to have Time Sources as trait objects for the Timer, for both real time and game time. The game time one should probably be optional and the real time one could be the atomic clock, manually set for unit tests, or some kind of synchronization.

I'd really like to have a way to manually get time stamps from the time source for the hotkey system, and once the hotkey goes through, this time stamp is then used for processing the times. I'm not entirely sure how that fits in, as it should be able to be used with any time source (or rather with any pair).