Make a minimal module for development of new games

[RMTEW FULL NAME]

Currently, there's only Hall of the Goblin King. Knowing what has to be removed and added to make a new starter module and location, is unclear.

Someone who knows what they are doing should strip it down and make a starter module.

[RMTEW FULL NAME]

First stages of a document to help people define their own modules. See #210

→ <<cset a594a571280c>>