minor perf(cpu): better order for "ignore terrain change" operations

By RobLoach:
- Correct MP games' first turn time 
- Restore Civilopedia Event-based Tutorials 

By EmperorPinguin:
- AI: don't send workers to other civ's territory 
- AI: keep wandering if inadvertently ended up in foreign territory 

MP server: Display URL errors & optimize redirects - By touhidurrr

Change mounted attack sounds - By SomeTroglodyte

Gain city-only stockpiles from provides/consumes uniques - By SeventhM