Some flight and camera improvements

I've added a few adjustments to the flight model and the cameras in this latest build:

• At slower speeds, you have some direct yaw control (left/right) in addition to the normal roll
• Hovering will continue as long as you hold down the flap button, you do not need to hold back and flap together
• The camera moves to a nicer place now when hovering, breathing fire, and in first person mode
• Flames spew out a bit faster to make it easier to aim
• Aiming your fire is smoother
• Fire breath casts more light
• Slight performance improvement because of trees