Mecha refactor 2020 (#52902)

-Mechs are a vehicle subtype
-Mech equipment half-rewritten
-Mech actions completely redone
-Cooldown macros
-New movement macros & replacing all var in GLOB.diagonals with ISDIAGONALDIR(var)
-New lazylist macro
-Support for lavaland only mechs
-Removed the tank because fuck off with that hacky shit
-Documentation
-Fuckton of fixes

code/modules/mob/dead/observer/observer.dm

@@ -25,7 +25,7 @@ GLOBAL_VAR_INIT(observer_default_invisibility, INVISIBILITY_OBSERVER)
 	var/datum/hud/living/carbon/hud = null // hud
 	var/bootime = 0
 	var/started_as_observer //This variable is set to 1 when you enter the game as an observer.
-							//If you died in the game and are a ghsot - this will remain as null.
+							//If you died in the game and are a ghost - this will remain as null.
 							//Note that this is not a reliable way to determine if admins started as observers, since they change mobs a lot.
 	var/atom/movable/following = null
 	var/fun_verbs = 0