Support zSpace Inspire
Add support to new ZSpace Inspire hardware.
This hardware do not rely on quad-buffering to display stereo content and should use a dedicated render window class handling the new stereo display mode.
This new stereo display mode requires a dedicated stereo style preventing QVTKOpenGLWindow to blit into the backbuffer (zSpace API taking care of it)
Related ParaView MR: paraview/paraview!6688 (merged)
Edited by Thomas Galland