Rough level builder in VR

Only knuckles controls listed here for now:

• Teleport: Hold analog stick north
• Snap Turn: Tap analog stick west / east

Hold the grip to enable these controls for that hand:

• Pan: Hold trigger with one hand, drag
• Rotate: Hold triggers with both hands in a horizontal plane, pivot
• Scale: Hold triggers with both hands in a vertical line, move towards / apart

• Tool Menu Wheel: Hold analog stick south

Used to select, move, duplicate and delete vertices (room corners).

• Move: Hold trigger while hovering over a vertex, drag
• Multi-Select: Hold A, then use trigger to select / deselect vertices
• Axis-Aligned Drag: Hold B while dragging
• Duplicate: Start dragging one or more vertices, then press A

Deleting vertices is TODO