Puppet cities generate no extra unhappiness (per Civ V)

Resolved crash when resuming game after closing it quickly

Modding: Removed deprecated uniques

By OptimizedForDensity:
- Improve AI belief picking
- Unstack enemy unit strength modifiers
- Prevent theme music tracks from randomly playing
- Fix latest untranslated strings

By alexban011:
- Increase mod search request page size
- Puppeted cities can no longer become capitals