Fixing Core Distance Issues

This weekend I focused on reenabling all the events that I disabled while working on tribal expansion and territories, and tried to fix some issues that I left over from previous changes. I'm still working on an issue with core distance calculations that hopefully will improve the behavior on some of the existing decisions. Though I don't think it will take that long to sort out that issue.

The plan after that is to make some actual changes to the UI to add an action bar. This action bar will be used to introduce new ways to interact with polities and factions under their control. And the first action I will add to it is the one that will let a player select a target region to encourage migration towards. The plan is for actions to be moddable just like decisions are. So modders will be able to add new polity actions to the game. But the effects of actions will be limited by those effects currently available to modded events and decisions, and whatever I'm able to add for 0.3.4, which, admittedly, won't be much.

Since actions should also be available to the AI, I will also have to implement a way for modders to implement some basic AI logic so that AI controlled polities can also execute actions every now and then.

Next weekend I'll focus on the design aspect of the new action system and hopefully I'll have a non-working mod example.