Add new tilemaps for ability to have multiple different map designs

Using a tilemap tool, create new tilemaps other than the default "garden" and allow it to be either selected or randomly picked.

Default:

Ideas:
- Beach
- Fairground
- City
- Forest

No files or tests are named. Start by locating the default "garden" tilemap and the entry point that chooses or loads it, then review how tilemaps are created with the project's tool. Done means additional designs such as beach, fairground, city, or forest can be selected or randomly picked instead of only using the default.

Written by the indexing model from the issue text.