This updates ParaView to incorporate changes to VTK to support EGL and
GLX in the same build. We also take this opportunity to clean up a few
things:

1. ParaView processes can now decide if they need to be off-screen
   or on-screen on their own. This is based on the process type and
   configuration ParaView is running in.

2. Users can override this by passing new command line arguments to the
   process: `--force-onscreen-rendering` or
   `--force-offscreen-rendering`. The old `--use-offscreen-rendering`
   flag is now deprecated and is interpreted as
   `--force-offscreen-rendering`.

3. Deprecated vtkPVDisplayInformation and replaced it with
   vtkPVRenderingCapabilitiesInformation. This provides more information
   that just DISPLAY.

4. vtkPVOpenGLExtensionsInformation is deprecated since it not useful
   anymore. Client applications don't need such exhaustive extension
   query.

5. vtkPVOpenGLInformation was cleaned up to avoid making OpenGL calls
   itself. Instead, it queries the vtkRenderWindow. It also provides
   full extension list, a semi-replacement for
   vtkPVOpenGLExtensionsInformation.