Before detonation, supermatter pulls all objects, including anchored objects in a 13-tile radius (just enough to cover the control room) towards it for 10 seconds. Windows within this radius are immediately shattered.

Supermatter no longer pushed around by airflow.
Unanchored objects and players without magboots are pulled twice as fast towards the supermatter.
Supermatter shards have a smaller pull-radius.

Leftover variable removed.
Custom item for YankeeSamurai: Hal Ishimaru
Merge branch 'dev' of https://github.com/Baystation12/Baystation12 into dev
Vox skipjack now filled with nitrogen

Added an oxygen canister, breathmasks and tanks for "guests," thought I
don't think they will be needed since people rarely get to the skipjack
without internals of their own.
Added second vent to skipjack airlocks

Hopefully this will encourage players to not just force the airlock
doors every single time.
Adds a few backpacks to starboard maintenance
Round no longer ends suddenly

Instead, a crew transfer vote is called. Also adds cleanup proc to
game_mode.
Mentor changes.

Mentors no longer see stealthmins
Mentors no longer see antagonists / have check_antagonist verbs
New debug verb:  Reload Mentors (or mods)
Supermatter becomes anchored when detonating, and is hence not pushed by mobs than gib against it.
Detonating supermatter immediately turns the zone into vacuum.
Spam from objects disintegrating against detonating supermatter removed.
Pull radius increased to 14.
Fixes config.continous_rounds and adds check
Adds cleanup for heist mode
refactors some disposals filtering code and remaps some disposals pipes

New things!
/obj/structure/disposalpipe/tagger - retags a holder when it passes through
/obj/structure/disposalpipe/tagger/partial - retags a holder when it passes through two times; good for loop detection
/obj/structure/disposalpipe/sortjunction/wildcard - filters out all holders that are tagged
/obj/structure/disposalpipe/sortjunction/untagged - filters out untagged holders

Tagging doesn't use an icky list index system any more, tags are put into a global list and directly checked against.

Changed the map around a bit, disposals is now a proper loop but anything that's not tagged, is tagged with "Disposals" or anything that passes the tagger twice will be filtered out.

Not a feature, just a fix for drones being sad about weird disposals. <3
Merge pull request #5120 from Zuhayr/dev

Merging master into dev.
Fixes a minor icon-flicker thing with the drone fabricator.
Merge pull request #5122 from Zuhayr/master

Fixes a minor icon-flicker thing with the drone fabricator.
Merge pull request #5117 from Ccomp5950/mentor_change

Mentor changes.
Added mechanism to change barsign design, so bartenders aren't stuck with whatever the RNG picks.
Change crew monitoring computer to use NanoUI