AI tile evaluation considers Faith

Civ-wide uniques for city-wide resources

Added 'city addbuilding', 'city removebuilding' console commands

Add unique to conditionally control construction costs

Added conditional for exact amount of population in a city

Mod checker:
- Unique conditional corrections, and better correction
- Limit tech column building/wonder costs warnings to when required

Unit upgrade menu can scroll - By SomeTroglodyte

Military unit healing improvement  - By tuvus