- Ports the overmap, ships, sectors, and "landable" ships from baystation.
- Ports necessary computers to control ships and overmap shuttles.
- Shims missing machine and computer functionality pending future enhancements.
- Includes required new sprites and sounds.
* The vast majority of gas mixtures never use their `graphic` list. Prime candidate for making a lazy init list.
* While we are here, add nullchecks to ZAS's use of the graphic list a bit. /turf/update_graphics was technically already null safe, but its even better to not bother calling it at all right?
* Initializing a list in the type definition (of any type) incurs a hidden proc call ("init"). Simply by moving the init of the lists to /New() we speed up creation of /datum/gas_mixtures (which happens *often*)
* The list variables still get initialized by the time the instance is created, so this has zero impact on other code, its just starightup faster with no downsides.
This happens because edges cease processing when the delta between their zones is small enough. This is normally a fine optimization, but when it results in a room at 4kPa with a window open to space, it breaks imurshuns.
Two main changes to solve this problem without too much cpu cost:
1) Stop edges from sleeping if one side is a hard vacuum. This ensures that a zone doesn't freeze at a low-but-non-zero pressure when touching hard vacuum.
2) Prevent #1 from causing the edge to stay alive for ages while pressures asymptotically approach zero as they are repeatedly equalized but only half is dumped to space. (Would happen if ZoneA---ZoneB---Space arrangement exists) by detecting when the total amount of air left is small enough that it would normally sleep anyway, and just setting it to zero.
The end outcome is that behavior is mostly the same as before, except when zones have an open path to unsimulated space, they will reach equilibrium at zero instead of semi-random lowish values.
Fixes rooms showing wrong pressure after reaching equilibrium.
* If we do not do this, zones are left with the wrong total_moles (and therefore the wrong **pressure readout**) after equalizing.
* Equalizing happens when two connected zones get close enough to suspend processing. Thus the effect of this bug would be wrong pressure readings on rooms that are no longer being updated, thus locking in the wrong value!
