Store flip in SFG saved from GUI
Now, the flip-status is not stored. Position is stored as https://gitlab.liu.se/da/B-ASIC/-/blob/master/examples/twotapfirsfg.py#L32 but one should possibly only create a single dict with all properties (including SFG name), instead of adding another for flipped (and possibly more things added later on, like color, rotation etc...).