Add support for oculus touch controllers

[cooperra]

File operations seem to work.

No support for teleport controls yet as binding multiple events requires a non-trivial update to aframe-teleport-controls and aframe-master.

Also, when I tested on Oculus Quest, I had to remove camera="userHeight: 1.6" or my head would be high above my hands. I left that code in for now, but it should probably be removed when the dependencies are upgraded.