Added changeling shields and armor.
Minor shit related to changeling mutations i don't exactly know what.
keeping comments up-to-date is v important :v
fixes typos
Adds sprites to ling armor & shields.
Merge branch 'master' of https://github.com/tgstation/-tg-station into changelingshieldsandarmor

Conflicts:
	icons/mob/head.dmi
	icons/mob/items_lefthand.dmi
	icons/mob/items_righthand.dmi
	icons/mob/suit.dmi
	icons/obj/weapons.dmi
Stops players from seeing the coder conspiracy
Merge branch 'master' of https://github.com/tgstation/-tg-station.git into Bugfixesgalore
MONKEY MODE: "IT ACTUALLY WORKS" EDITION

Probability support for monkey mode.
Player config support for monkey mode.
Check Antags support for monkey mode.
Added a spinning visual effect to rolling on the floor to extinguish yourself in case of a fire.
Lube will now make you spin while you're slipping.
Water will make you slip on the spot and won't move you forward.
Fixed the bug of wrong mob directions when buckling them while they are lying down.
Removes wonky luminosity check from soil plots that was causing problems.  Was not present in real hydro trays.
Puts the irrigation check back to anchored==2 like it's supposed to be.  Oops.
Comments the anchored variable in a few places so people don't make the same mistake.
ai spacecarp hologram
Changes the layer for items on trays to -1.  This makes them display on top of the tray, but not above other things.
Oh, not in cruelty, not in wrath
  The Reaper came that day;
An angel visited this damned sat,
  And took the parapen away.

Replaces parapen with sleepypen that contains 30u of sleeptoxin and 30u of a new mutetoxin that makes you unable to speak.

Mutetoxin can be made with 2 parts uranium + 1 part water + 1 part carbon.
Refined the implementation of the AStar algorithm :

*Reorganised and commented used procs for better visibility/maintenance
*Redid the PriorityQueue class
*Changed the euclidian distance to the byond one (so that we don't calculate float and square root when it's not necessary)
*Made the AStar algorithm use the closed list instead of just filling it
*Some optimization in the open list sorting : last entered is first in case of f ties, slightly less tiles are checked now
*Changes the order directions are checked when adding adjacents turfs to make for more 'realistic' path (read less 'drunk pathing' with lots of diagonals)
*Fixed some turfs densities not being check for diagonal movement
*Closed firedoors are now correctly seens as blocked by the algorithm
*Cleanbots now only moves in cardinal directions, like other bots.
*Updated the info text at the beginning of the file a bit
*Absolutely unrelated : simplified the turf.Bless() proc
New Sprites for AI HUD!

Provides a new sprite set for the AI HUD from MrSnapwalk!
Fixed the crash with immovable rods
Merge pull request #4139 from Aranclanos/immovablerods

Fixed the crash with immovable rods
Merge pull request #4118 from Aranclanos/spinning

Spinning
Revert "Spinning"