Fixed mosque of djenne not working until industrial age

By Fanfblrik: 
- Don't wipe city-state relations on liberation 
- Freeze Demographics rankings to turn-start snapshots 

fix: MP upload no longer causes improvements to advance - By cy-elec

By WhoIsJohannes:
- AI improvements: parallel settlers, expansion un-latch, research agreements, annex guard 
- CPU performance improvements 

By SomeTroglodyte:
- Fix "on losing unit" triggers running when a new unit can't be placed
- Allow limited conditionals on UniqueType.HiddenFromCivilopedia
- Catch load from custom location exceptions
- Fix the tile info "needs tech" line