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ENH: observers of undo/redo in legacy editor

Steve Pieper requested to merge github/fork/pieper/add-editor-undoredo-observer into master

Editor extensions that needed to hook into the undo/redo functionality needed to connect to button signals, which is fragile when the editor is embedded in another module.

See discussion here: https://github.com/QIICR/PETTumorSegmentation/issues/10

With this change the extension effect directly observes the undo/redo class. Multiple observers can be used.

The older callback API is left in place for backwards compatibility.

The PETTumorSegmentationEffect is being updated to use these new calls.

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