Allow Pigs to use farms, berry bushes etc

[Szczuku]

So some time ago I made a thread talking about how Pigs should get more and more inteligent and advanced as the in-game days progress.

But I quickly realised that it probably won't happen so here's a simpler version.

Pigs should be able to harves berry bushes, juicy berry bushes, farms and maybe carrots and mushrooms in the ground.

Instead of eating seeds they'd plant them if there's an empty farm max 5 tiles away from them. And If there's withered berry bush they'd also fertilize it.

[axxel]

I think Gobblers should steal from farms, too.