A generic term like this isn’t really suitable for trademark, nor
likely to ever be disputed. The community and the engine both heavily
bias toward “episode” and indeed most other games do.
Closes: #682
Add monsters throughout the map, keyed door flags and the keys
themselves, and all-around fleshes it out. Resolves#33
Signed-off-by: Mike Swanson <mikeonthecomputer@gmail.com>