Change modding system

[Rorkh]

Change modding system

[vaughantay]

It's definitely an interesting idea, and it's giving me some ideas on how to change mods (which I admittedly haven't updated at all since Possession). I think making it so that they and the data files work in the same way is a good idea.
But I don't think we're quite able to do that to the degree you're talking about at this point without a bit of reworking how things work.

For one, there's some stuff in data/ that is pretty necessary regardless of game and that mods shouldn't necessarily need to have (the map layouts and AI come to mind), but those might be worth moving somewhere else.

Also, when making an actual game with this, you'll probably want there to be a core set of data it loads by default. But I can see how putting in a way to not load that data when there's a different mod to load may be useful.