Erronous undo behavior #143

Issue

• undoing node serialized data breaks the graph currently, it seems like only changes to NodeGUI are recorded, for example, the filter node doesn't record changes to the filters list, only the changes to the output nodes, so if you change the filter regex on an entry, it will update the output connection label but when you undo it will only undo the label on the output connection but not the actual change (this is also true when adding new filters/removing them) it looks like RecordUndoScope isn't working as intended.