Tarsier: Renderer flight controls

Here's where we should list all the keys etc used to fly in the Renderer.

• Alt + up-arrow: Increase movement factor
• Alt + down-arrow: Decrease movement factor
• Alt + left-arrow: Decrease angle factor
• Alt + right-arrow: Decrease angle factor

• Shift + up-arrow: move up
• Shift + down-arrow: move down
• Shift + left-arrow: move left
• Shift + right-arrow: move right

• Control + Shift + up-arrow: Move foward
• Control + Shift + down-arrow: Move backwards

• up-arrow: tilt up
• down-arrow: tilt down
• left-arrow: pan left
• right-arrow: pan right

• control + left-arrow: tilt left
• control + right-arrow: tilt right