OrigamiDraw

- You have been asking for it: removing unnecessary nodes! This can be done by copying and pasting onto an empty canvas. This way, all references are still in the old CP but the new CP is clean as a whistle. - Mirror fold: Entry order has been reversed: first select the fold to reflect, then the mirror. If you land on a point with multiple possibilities, the latest fold remains selected and you can choose a new mirror to continue the propagation. - Undo / Redo now works across sessions. When the app is relaunched, Undo is locked but can be unlocked with a long press. - Continuous angle mode: for those working in a fixed angle system (22.5, 30, or 15 degrees), a long press allows repeated entry of angle-constrained folds.