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Implements undo/redo for node add/delete and port connect/disconnect. Fixes connections failing to update in render view during certain operations.
…s (use value passed into closure no need for self in many undo), add undo for moving groups of nodes, as well as add redo for that (partially) at least.
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Build off of @JustinMeans 's initial undo implementation, make some minor clean up, and extend undo to support node movement undo / redo in the canvas.