Merge branch 'dev-freeze' of https://github.com/Baystation12/Baystation12 into dev-freeze
Merge branch 'dev-freeze' of https://github.com/Baystation12/Baystation12 into dev-freeze
Fixed accidental rename during Phoron project
Fix to breathing in bad air.
Clarifies comment wording

Small things
Merge pull request #5092 from Ravensdale/dev-freeze

Fixes accidental renames during Phoron project
Readds icon_states removed by RKF in #4775

How was this not seen faster, I don't know.
Fixes #5109
Fixes #4973
Drones fixes.
Fixes #5098
Typo.
Merge pull request #5110 from Jarcolr/StealthRemoval

Readds icon_states removed by RKF in #4775
Merge pull request #5111 from Zuhayr/master

Fixes
Removes explosive implants from nuke ops
Mentor changes.

Mentors no longer see stealthmins
Mentors no longer see antagonists / have check_antagonist verbs
New debug verb:  Reload Mentors (or mods)
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 #5115 from Hubblenaut/master

Removes explosive implants from nuke ops
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.