"Requires a [buildingFilter] in at least [amount] cities" works correctly with filters that aren't building names

AI only buys tiles contiguous to the current city tiles

Undo Move button moved to the right, so other buttons stay in place

By SeventhM:
- Check for trigger conditions on new game techs
- Fix when units can be purchased

On City Raze, previous owner doesn't pay Road Maintenance  - By itanasi

By SomeTroglodyte:
- Defense against circular references in Promotions