New OMR WebGL Render Engine

[Travis Cobbs]

I have compared the latest and previous revision. Both have panning work on the floor plane.

This is opposed to how panning works in Orthographic mode (See sample_view.htm). If you know how to switch between the panning modes without changing the camera type, then I can implement the switch in the UI.

Sorry. I could have sworn that panning worked right in the past. I don't know anything about the JS tools you are using, so I don't know how to make it work right. Ideally you want to have it move the camera (in the opposite direction) instead of moving the model.