Automatic Material Translation (AMT) system for swapping material palettes. This will allow an editor to specify eligible themes for a room and preview the room's appearance in a variety of themes. Some theme swaps may not be fully reversable, so a temporary copy should be saved to revert to.

See https://github.com/Timberjaw/Dungeonator/wiki/Themes for AMT theme info.

This task is in progress. The basic theme-switching command and theme infrastructure are in place. Themes can be switched live in the editor but not saved.

Saving and loading are now supported. Add, remove, and set default commands are supported.