Update mods even if we have cached data 

Modding: Unit icon falls back to UnitTypeIcons/<unitType> successfully

Cities reduce tile movement cost to 1 (on e.g. hills), per Civ V

Add Specialists Tutorial - By itanasi 

Add `<when espionage is enabled>` conditional  - By RobLoach

Allow purchasing wonders with gold when explicitly given a unique - By SeventhM