Use the font scaling provided by vtkTextActor.
This will increase the size of fonts used on displays with high pixel densities. Also, this changes the signature of vtkTextActor::GetBoundingBox() to take a vtkViewport. Since this is a new method for VTK6, it is better to fix it now; having it pass a NULL viewport pointer internally was causing crashes. Finally, vtkTextActor::SetConstrainedFontSize() should take font scaling into account. Change-Id: I3cc99f99798da96f5c8e9249538ba269216e302a
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