Cultures: Melting Pot / Emerging Cultures

[LordPeter]

• [ ] Introduce [redacted]
• [ ] Write "automated" systems (meaning heavy use of scripted triggers) for culture conversion events, taking into account [redacted]
• [ ] Same system for melting pots
• [ ] Same system for emerging cultures
• [ ] Find a way to display [redacted] to the player (bring back fake map modes?)

Part of this (conversion) actually also applies to religions - but they aren't ready yet, so the system is being written for cultures only for now.