Predetermined stuff for the scenario editor

[setapdede 238]

In AoH2 we had suggested civilizations for whenever we'd create a scenario. So I have some ideas for this and some similar features.

First, make a way to properly edit the suggested civilizations and other suggested things, not just being able to generate them based on all the scenarios on that map, but being able to go by yourself and add suggested civilizations on a province.

Second, what about suggested borders? In the second game I found it quite hard to recreate borders in South America or Asia because of how large these countries were and how tiny were the provinces, and assuming that there's going to be even more, this might help solve this issue.