Fix crashes on undo/redo of vector path points operations
1) KoPathToolSelection keeps pointers to the shapes and its path points, therefore it should subscribe to the updates on the shapes and their points (using ShapeChangeListener framework). 2) The patch also fixes a lot of bugs in "Join by segment" and "Merge points", which should behave correctly now. 3) The patch also partially implements "keep path point selection" idea, which selects newly created point after each operation. The stuff is achieved using KoPathShape::PointSelectionChangeListener listener. BUG:393209 BUG:393087 (cherry picked from commit f919e7f2dbed028e8fdae89b58ed6f5af26760db)
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f8556aa8
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