Hand tracking controller bindings

Current bindings for ALVR 14.0.0

There's no trackpad/joystick position mapping.

Oculus Rift S

Action	w/ handtracking pinch	w/o pinch
Trigger	index + thumb pinch	index finger curl
Joystick press	thumb press towards palm	thumb press towards palm
Grip press	middle, ring, pinky fingers curl	middle, ring, pinky fingers curl
A	right ring + thumb pinch	N/A
B	right middle + thumb pinch	N/A
X	left ring + thumb pinch	N/A
Y	left middle + thumb pinch	N/A
Menu button	left pinky + thumb pinch	N/A

Valve Index

Action	w/ handtracking pinch	w/o pinch
Trigger	index finger curl	index finger curl
Grip press	middle, ring, pinky fingers curl	middle, ring, pinky fingers curl
Trackpad press	thumb press towards palm	thumb press towards palm
A	middle + thumb pinch	N/A
B	index + thumb pinch	N/A
System button	ring + thumb pinch	N/A

HTC Vive

Action	w/ handtracking pinch	w/o pinch
Trigger	index finger curl	index finger curl
Grip press	middle, ring, pinky fingers curl	middle, ring, pinky fingers curl
Trackpad press	thumb press towards palm	thumb press towards palm
Menu button	middle + thumb pinch	N/A
System button	ring + thumb pinch	N/A