Fixes#1542Fixes#1396
* Disables the Supply Demand event until it can be reworked to be more interesting.
* Removes volatile fuel from the possible gases leaked in Atmos Leak event.
* Excludes areas around spawn points from the Atmos Leak event.
* Prevents gravity failure from disabling gravity on planetary z levels.
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.
Only two more this time:
Random space dust attack.
Random gravity failure.
Moves space vines from moderate to major events, due to its now more dangerous nature.
Removes now irrelevant alien/ninja customized event handlers.
Adds Excel sheet for aiding in event probability calculations.
