* Add basic structure of z-level traits
* Restore space transitions and add z-level debug verb
* Restore proper ruin spawning and transit level creation
* Replace station_z_levels and related checks with traits
* Eliminate more uses of ZLEVEL_{STATION_PRIMARY,LAVALAND}
* Configuration datum refactor
* More WIP
* New easier on the eyes format
* More WIP
* Finished config.txt
* Fucktons more WIP
* The end of conversion draws near...
* Add all this shit
* Done converting entries finally
* Hunting down compile errors
* More WIP
* MORE CONVERSIONS
* More WIP
* More WIP
* Oh shit only 90 errors this time!
* IT COMPILES!!!
* Fixes world start runtimes
* Mice no longer spawn on grilles
Fixes#21574. Mice no longer spawn on cables that have dense objects
also on the tile.
Also added the Mice Migration event, used for debug purposes, currently
disabled.
* Uses proc that exists to check for density
* Restructured handle_environment()
This creates the environment_is_safe() proc for simple_animals
* Mice are placed at roundstart randomly
Rejoyce as wires are bitten in random locations.
* Removes all mice from the maps
* Code review
* Code review II
