Finished Controls but not Camera

In this commit, I completed the aerial maneuvers. The camera will not
follow behind the player during maneuvers, though. Otherwise players
might get motion sickness. My next commit should fix the camera issue.
In case you need help understanding how maneuvers work, here are the
controls:

Left-Click - Fire Weapon
W - Boost
S - Brake
A - Strafe Left
D - Strafe Right

While Right-Mouse Button is held down:
W - Loop
S - U-Turn
A - Dodge Left
D - Dodge Right

You can use maneuvers by holding the corresponding button and
right-clicking as well. You can either hold the button and click, or
hold the mouse-click down and press the button.