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.
In this event some sort of gas leak occours! A random area on the station is chosen to experience a leak of a randomly chosen gas!
* By default, areas with any people in them are protected, so it won't just kill someone.
* A warning announcement is given shortly before, so there is some warning.
* Dorms, Shuttles, Holodeck and Supermatter are protected.
* At higher severity, adds worse gasses and possibility of high/low temperature.
In this event some sort of gas leak occours! A random area on the station is chosen to experience a leak of a randomly chosen gas!
* By default, areas with any people in them are protected, so it won't just kill someone.
* A warning announcement is given shortly before, so there is some warning.
* Dorms, Shuttles, Holodeck and Supermatter are protected.
* At higher severity, adds worse gasses and possibility of high/low temperature.
