More Wilderness Generation

Wrote a couple quick scripts to generate some types for the wilderness submaps. Got a sand, dirt, grass and water type. They're derivative of the overmap types, but done in 128x128 tiles sizes, rather than the 64x64 tile size of the overworld. I decided to go with a larger tile for the submaps, to allow for greater detail in the tiles.

The types do need some tweaking (I especially don't like the grass) but they'll do for placeholders for now, while I tweak and tune the wilderness generator and start building up a stock of assets.