Assigning "Summit" and "Farewell"-stamped maps in mod campaigns

This is low priority to work on, but it lets us have a chance to really *use* those stamps on mod campaigns, which would otherwise be unable to receive the Farewell stamp with the new changes to the ticket sleeves.

Perhaps we can set metadata somewhere to indicate "this map sets Summit stamp" or "this map sets Farewell stamp", particularly if a campaign has an appropriate map but then continues past that point chronologically.

It's really just a beauty support for longer campaigns, if and when we start getting those.