Fixed tech dependency related crash

Unit by default not selected on turn start

Added 'upon turn end' trigger

By SomeTroglodyte:
- City-state bonuses respect 'hidden from users' modifier
- (UI) Politics overview diagram: Add legend popup

By tuvus:
- Added AutoPlay until end setting
- if all players are defeated, one player will be processed

Enable Domination to Capture All Capitals - By itanasi