Updated Controls

I've updated the controls in a major way, adding impulse forces when first thrusting forward, reversing, and strafing. This makes the game much more face paced and adds a lot of control for the movement. The bots have not been updated to take advantage of the new controls, so they will be a bit slow and easy to beat for the time being. Overall I think this was a much needed change, although some balancing/updating will surely be needed in the future.