Skeleton and pose offsets

[paul-marechal]

Similar to GodotVR/godot_openvr#121 but slightly worse here.

Illustration: https://www.youtube.com/watch?v=aKm0C06oFiQ

For some reason, when testing the demo scene I noticed that the skeleton hand movement was amplified compared to the actual movement input, while pose data is having the opposite problem where it lags slightly behind the controller's position.

HMD: Valve Index @ 120Hz

[BastiaanOlij]

This is an upstream issue I already reported to Valve. They are smoothing controller tracking slightly differently then the skeleton data causing this disparity.