AI improvements - By EmperorPinguin

By SomeTroglodyte:
- Fix City button problems
- Miscellaneous fixes and small changes 
- Distance-based unit cycle order (opt-in)  
- Fix battle modifier not being translated 
- Fix OneTimeRemovePolicy triggered Unique
- Prevent crashes from mod preview files

Added a command to spawn barbarian encampments - By GameCobra

By RobLoach:
- options: Add Micro, FullHD, and QuadHD screen sizes
- city: Display City-Wide Resources