[vtkusers] VTK OpenVR/Vive updates

[Ken Martin]

I have merged some updates to the OpenVR code into VTK master. Some of the
changes are listed below.

Thanks
Ken


Add floor option to show a floor

completely rework the matrix and coordinate code to be cleaner and use
standard VTK conventions (right handed)

add support for a dashboard overlay with options to subclass and support
for saving/loading camera poses and adjusting motion factors and scale
factors.

Improve the resetcameraclippingrange to work better for VR

change how eye position is handled to address VolumeRendering issues

Handle the case where people make the cubes invisible which results in a
308 error on loading the model.

Add support for the user to specify the mapping of physical coordinates
into world coordinate. Allows for different view up vectors other than the
old code which was hard coded to Y.

Add middle mouse support mapped to the grip button.

Add some support for a hardware clipping plane.

-- 
Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
518 371 3971

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