Revolting cities

[guillaume-alvarez]

The design goal is for new cities to pop from distant and scarcely controlled lands.

For this we will use the empire stability mechanism:

• it is a percentage, starting at 100%
• lost when losing battles and changing policies
• regained slowly over time

For every controlled tile over which influence is decreasing and lower than instability we could randomly check if the tile should revolt.

Then a revolting a new city would be created on the tile, as capital to a new empire. Its culture would be the same as the original empire one. It would start with the same discoveries/policies.

[guillaume-alvarez]

There should be a notification when a city revolts in player empire.