AI battle automation vastly improved for taking over cities

AI automation: Don't nuke cities that we're already winning against

By vegeta1k95:
- Rework of TileGroup: split into dedicated layers, initial preparation for slot-mechanics
- Optimized BorderedTable, refactored CityButton, new air table for units + misc

Better check for inquisitors blocking religion

Modding: Allow unique ruins stat gain notifications

Wonder overview uses viewing civ, not current player