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silx.gui.data.DataViewer: Added `selectionChanged` signal
This PR adds a selectionChanged signal to DataViewer and DataViewerFrame.
This signal is triggered after the selection has changed. The selection change can be the result of:
- An update of the selection by the user.
- A change to a view which support different dimensionality (e.g., moving from image to curve view).
- A change of data with a different shape.
closes #3628