Add WMR motion controller animations

[StephenHodgson]

Currently the Windows Mixed Reality motion controllers are loaded from the driver, but are not animated with the current input values from the device.

The WindowsMixedRealityControllerVisualizer implementation needs to be finished.

Migrated from XRTK/com.xrtk.core#39

Requirements

• Controller visualization matches real world position
• Controller animates with button pressed and trigger presses.
• Controller shows the current touch position on the touchpad.