Change the giant map option into a dedicated game mode for casual players

The giant map option at it's current state is (even if you take the extra portion lag away) basically insufficient for anyone.
Combine the Giant Map size with Free TC Placement + Optional Treaty + High Pop and you get exactly what casual players want.
At the same time, you can then replace Treaty mode, which just takes way too long and isn't worth it for the fact that you can't boom beyond 2/3 tc's anyway with a standard rule set.