This is an attempt to reset fairness in scheduling in the game. Basically, since we're not threaded we have to decide how many physics updates we want to run per draw and this more closely tunes things to the settings the player makes with Computer (simulation_atom size). It's important when testing this commit to see if it should be reverted to make sure your settings are matched to your computer. Slow framerate will == jerkier behavior, but game speed should remain divorced from framerate for the most part