Ability to copy and paste maps

[lexa609]

Hi!
1)Can I add the ability to copy a card to a buffer and paste it into another one?
2)Should I smooth the selected area?
3)The ability to undo the made change as ctrl+z

I have changed the categories of some cards in the definition of SC1CF0

SC1CF0.json

[TheFlashBold]

1. already possible
2. & 3. will come in the next release