fix(OpenXR): add support for HP mixed reality controllers

Adds support for HP mixed reality controllers. As these controllers lack touch input on the joystick this required some changes in the VR interactor to allow for the joystick or trackpad to initiate movement without an explicit start event. Most of that code was already there but some suppression code in OpenXR was preventing events with a 0.0 x or y from coming through which was wrong.