- FIXME: StackView isn't updated if stack changes....

- move undo to GCE::MapEditor

- migrate to Map.pm
- save open windows, pos. and size and selections
- implement Undo and make sure it works (deepclone)

- autosave of lore and msg attributes

think about:
- make click on attribute row in attrview set the entries?

future plans:
- exit verschieben
- make a copy of scorn and remove all exits
- move scorn up by 3 fields
- remove everythinfg except the floor
- replace the floor by another floor (wall etc.)
- modify an attribute of all dragons int ehs elected rectangle