Too many mandatory overmap specials warning

[lucianposton]

Game version: master branch, 8a96896

Mods active:

• More Locations
• Tall Buildings
• Urban Development

Expected behavior

Some ideas:

• Warn the user while he is adding mods that the selected mods have an issue. A normal user won't understand the debug warning.
• Remove the overmap special limit ?

Actual behavior

Steps to reproduce the behavior

• Create a world with > 72 overmap specials
• Create a character to trigger overmap special verification

[kevingranade]

in theory we can make that assertion when you add the module instead of when you load the game, though that could have some serious performance impact.

[kevingranade]

There's another rather good option, which is to remove the ability for mods to set mandatory specials at all. Instead missions and scenarios that declare them as a target would set them as mandatory, which are the only pressing reason to have a special be mandatory in the first place.