[Suggestion] Pre-game editor, add secondary divisions slots

[Wolf_pd]

In the pre-game editor the secondary divisions slots can be used to aid building things like regional Cups and dynamic relegation. Because there is only one slot you can only use it for one particular reason.

With more slots you could build extra Cups and use dynamic relegation through a whole football pyramid instead of just at one level.

[Kyle Brown]

Reviewed so locked.