Store Thumbstick, Trackpad etc. data internally in a vec2f.
The knowledge that a binding path ../x and ../y refers to the x and y components of this vec2f
is stored as an INPUT_REDIRECT_VEC2_X_TO_VEC1 or INPUT_REDIRECT_VEC2_Y_TO_VEC enum.
Actions now also store the index of the binding paths it matched to,
e.g. when an action binds ../trackpad/y to an input that provides bindings [../trackpad, ../trackpad/x, ../trackpad/y],
the index 2 is stored.
v2: Clarify preferred binding path index variable
v2: Add basic 3DOF Index Controller support
Only the "gen1" watchman usb protocol is supported (almost same as vive wand).
Note: Lighthouse v2 data is not properly ignored, the IMU data is only parsed correctly
when controller is not hit by lighthouse lasers.
Supported:
* trigger value
* trigger button
* trackpad x, y
* trackpad touch
* thumbstick x, y
* thumbstick click
* system click
* a click,
* b click
Not supported:
* trigger touch
* touchpad force
* thumbstick touch
* system touch
* a touch
* b touch
* grip squeeze
* finger tracking
