* Remove ZLEVEL_STATION_PRIMARY
* Add Up and Down traits for use by ladders and chasms
* Give map_config creation its own proc
* Combine LoadConfig and ValidateJSON and remove transition_config
* Make space linkage a z-level trait
* Remove ZLEVEL_EMPTY_SPACE
* Update uses of GetFullMapPath
* Handle multi-Z stations and load Lavaland and Reebe at runtime
* Remove unused space maps
* Fix inappropriate z-expansion in map reader, improve logging
* Update comments relating to z-level configuration
* Add Lavaland and Reebe to ALL_MAPS
* Add a proc for getting the station center
* Add a couple of comments to ZTRAIT defines
* Remove unused global_map list
* Refactor weather to use the trait system
* Un-hardcode the transit z-level
* Use Z traits to determine Portal Storm event areas
* Fix loading away missions containing anything that reads traits