Remove dependency of OpenVR from ViewerVTK
Building the ViewerVTK library should not require OpenVR
(or even OpenXR being added in !767)
To maintain the naming convention, ViewerVTK
could be split into ViewerVTK
and ViewerVTKOpenVR
Building the ViewerVTK library should not require OpenVR
(or even OpenXR being added in !767)
To maintain the naming convention, ViewerVTK
could be split into ViewerVTK
and ViewerVTKOpenVR