Added reference counter for PathObjects #1931
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Also fixes a bug where node handles in the editor would persist after a path is deleted, resulting in undefined behavior. It does not, however, remove nodes upon deselection; it only removes nodes when the path itself is deleted.
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Automatically manages a path's lifetime based on whether or not it is referenced by other objects.
Also fixes a bug where node handles in the editor would persist after a path is deleted, resulting in undefined behavior. It does not, however, remove nodes upon deselection; it only removes nodes when the path itself is deleted.