WebVR Lab example handle vrdisplaypointerrestricted events

The WebVR lab sample (and others) do not handle the vrdisplaypointerrestricted events, so on some headsets (such as the Windows Mixed Reality devices) mouse input will not work when input is being sent to the headset (ie, it is being worn).

The fix is straightforward, basically just need to take pointerlock in response to window.vrdisplaypointerrestricted event.

I made a forked project with a fix put in to “/scripts/input/gaze/mouse-input.js” (lines 28-34):
WebVR lab - is it possible to put these changes in your example, so anyone forking your project in the future will get this fix?