[vtkusers] Rotate the camera

[Max]

Hi Sun Tao,
Elevation is a tricky one, since after you rotate by more than 90 degrees,
it gets a problem with view up vector and changes the axes, and you get
something not intended.
I solved it by:
private void ElevateCamera(double angle)
        {
            //5 is chosen since 360 / 5 < 90 and there is a problem with
angles bigger than 90
            double elevationPartialShift = angle / 5;
            for (int i = 0; i < 5; ++i)
            {
               
WindowRenderer.GetActiveCamera().Elevation(elevationPartialShift);
                WindowRenderer.GetActiveCamera().OrthogonalizeViewUp();
            }
        }



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