* Adds defines for world.tick_usage
* This provides no useful benefit whatsoever, but /tg and Baystation12 have done it, so it will make porting future code easier if we do too. No real harm done either.
A null entry somehow got into ```player_list```, which caused an important proc called ```get_mobs_and_objs_in_view_fast()``` to fail. The cause appeared to be a brain mob failing to qdel, then failing to ```logout()```, leaving a null entry in ```player_list```.
```get_mobs_and_objs_in_view_fast()``` now makes sure every entry it iterates over exists, and this should fix the qdel issue as well.
Semi-rewrites how surgery failure works. Using an improper surface will call the surgery step's fail proc instead of just doing a melee attack.
Adds 'surgery odds' var to objs, which determines effectiveness. The numbers for operating tables/roller beds/tables remain unchanged from the previous version, however doing it this way makes it cleaner to add new surfaces in the future.
Adds a proc to get a surgery surface.
Also makes burn repair on FBPs more efficent, so that one scorched robot does not take literally all of robotic's wires.
* Creating new objects is cheap, in fact comparable to the cost of getting it out of the pool, so it doesn't help there.
* Placing items in the pool is far more expensive than letting them garbage collect due to the resetting of vars and such.
So you can customize your character with tattoos or fur colors for Taj or whatever. I'll let Anewbe work out what he wants to whitelist other than what I did already.
The icons are sliced up with the HumanScissors program I wrote, so they are per-organ. So, lop off a limb, put it on someone else, they have the tattoos and whatnot. It's part of DNA so it comes with when cloning.
They are defined in the normal sprite_accessories file and the icons are all in markings.dm in the format of "markingname-organtag" so if you have a marking that spans both arms and torso you need "thatone-torso", "thatone-l_arm", "thatone-r_arm" icon states.
* Compound icon generator proc
Why didn't this exist before? Am I missing something? I need manipulatable icons of existing atoms including their overlays. Is there some easier way to get them than this...?
* Polaris Portion of AI Upgrade
Somewhere on the station, a gas canister is faulty and ruptures, releasing its contents (no explosion).
* Added as an event_manger event. This version is nice on low severity and picks a canister with nobody nearby.
* Also added as a gamemaster event.
* Added helper method to check area occupancy.
* That if statement wasn't heping anyone as it was.
* Strangely however, even an `if(using_map)` doesn't help, as using_map is in some crazy BYOND limbo state at that point in world init. but checking istype() succeeds in figuring out its not real.
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.
