Variation

Still refactoring code, but making good progress. For one thing, there can now be multiple terrain types. The grid is now fully 3 dimensional. Pathfinding will now consider not only the tiles the bot is moving through, but the tiles it has to move over as well. Objects and units have been consolidated into a common type, and there can now be multiple objects on a single tile. Basically, all changes under the hood. It's not much, but here's a screenshot showing off multiple terrain types.