Fixed world wrap for games saved during 4.12.15

'gain control over tiles' trigger leaves your tiles alone 

By SomeTroglodyte:
- Fix new improvements becoming visible on non-observed tiles 
- Fix rare crash opening overview on turn 0 
- Console command to change difficulty 

AI is less motivated to declare war at higher difficulty levels  - By tuvus

By itanasi:
- Civilopedia Entries: Food, Production, Science, and Gold 
- Add Air Intercept Range to Civilopedia card