#9 Modified RenderWindowInteractor

[Jon Crookston]

The current camera manipulation used for rendering (RenderWindowInteractor, defined in CustomInteractorStyle.cpp) works in a way similar to the vtkInteractorStyleTerrain, which was used previously. This does not allow the textile to be inverted in the viewport, e.g. to see a perspective view with the lower side uppermost. It would be useful to allow the textile to be rotated freely in the viewport.
(Low priority request)