Removed dd-create Requirement for Exporting

Removed the code in DungeonHelper and CommandEndDungeonCreation that
would force the player to use "override" with when exporting dungeons
that DD did not recognized as having been built in custom dungeon
pockets. This restriction is no longer necessary now that we don't need
pockets with standardized orientations or Eternal Fabric boundaries.
Minor Change

Minor change. Renamed all the functions in LimboDecay to begin with
lowercase letters, as is the usual style for Java development. It
slipped my mind for some reason. Uppercase starting letters is the usual
style for C# development.