button previews for contextual controls

[outNEXT]

The controls are extremely confusing, and reading the readme included with that one pull request isn't ideal in VR, It would be nice if on the hand we get icons of what each button would do at the current moment.

[outNEXT]

Readme

They are quite simple and ~intuitive outside of H scene, inside though pop-up descriptions would do no good given how much variability there is.

With the range of what a button can do, I feel like seeing what said button will do before I press it would be very helpful. Currently, I feel as if each button in H scene never does what I expect it to do.