runTimePostProcessing FO camera update

• Removed the camera 'mode'

  • The (old) static camera was only appropriate when parallel projection was inactive, and the view was centred at (0 0 0)
  • Camera input now always requires 'position' and 'focalPoint'
  • Clip box is now optional. Note that this is applied after the camera set-up and so will override the camera position
  • View angle is only appropriate when not using parallel projection
  • Zoom now required, applied after all other operations
    • 1 = do nothing, >1 = zoom in, <1 = zoom out

  Example input:

        camera
        {
            // Total number of frames to generate
            nFrameTotal 1;

            // Parallel projection flag
            parallelProjection no;

            focalPoint  (0 0 0);
            up          (0 1 0);
            position    (0 0 1);

            // Optional entries
            clipBox     (-0.0206 -0.0254 -0.0005) (0.29 0.0254 0.0005);
            viewAngle   20;
            zoom        1.1;
        }