Links many map-specific details such as the station name, z-level information, and allowed jobs from global vars to map datum vars, which should help us maintain multiple maps at once in the future, which will be needed for the future Southern Cross.
Note that a config change will be needed to change GENERATE_ASTEROID to GENERATE_MAP, otherwise no changes should be required to continue normal map usage.
To change to a different map, it's suggested to tick the file that ticks all the other needed files, which for the Northern Star is called northern_star.dm.
The wizard den is no longer pitch black.
Fixes targeted spells using the wrong caster/source.
Adds some missing checks using the caster source above.
Re-logging should no longer cause a loss of spell UI icons.
Mind transfer should no longer cause unintended spell loss.
