Create map image files

[dsande30]

Tiles have the option of being one of 5(?) types:
0. Field
1. Grass
2. River
3. Pond
4. Road
5. House

We need tile icons for this. Preferable of a type that can be rotated to fit (for example a river should have a continuation and an end tile. Probabilistically our generator will decide whether a river ends or continues on, and we have to indicate that with two separate icons.

Edit: Matt had an idea to do this:

---

| _Direction |
| | | | <-- This is a terrible drawing but basically every tile has a center model
| | item | | and also 4 directions that have their own model
| ---------- |