ENH: Revamp label placement
- Adding new vtkLabelPlacementMapper to replace vtkLabelPlacer. - Making vtkLabelPlacementMapper the default in all rendered views. - Making label render strategies for freetype and Qt. - Fix memory leak in vtkQImageToImageSource. - vtkLabelPlacementMapper now supports multiple hierarchy inputs by using the new vtkLabelHierarchyCompositeIterator which uses round-robin to iterate through sub-iterators.
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