New config file for modders

The box party store page has been updated to include a config file for use with Ultimate Doom Builder, a map editor for GZDoom.

This is useful for modders whom wish to open Box Party in the map editor and not be bombarded with errors.

Instructions for using this config are included in a README file.

If you're wondering about the lack of updates to Box Party for 2 years, that's because I've been working on a new game, DI: Debt is Inevitable.