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

Control + Shift + Up-arrow: Move

Shift + Up-arrow: move up Shift + Down-arrow: move down Shift + Left-arrow: move left Shift + Right-arrow: move right