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/uplink/uplink_items.dm

@@ -1148,13 +1148,13 @@ GLOBAL_LIST_INIT(uplink_items, subtypesof(/datum/uplink_item))
 	name = "Dark Gygax Exosuit"
 	desc = "A lightweight exosuit, painted in a dark scheme. Its speed and equipment selection make it excellent \
 			for hit-and-run style attacks. Features an incendiary carbine, flash bang launcher, teleporter, ion thrusters and a Tesla energy array."
-	item = /obj/mecha/combat/gygax/dark/loaded
+	item = /obj/vehicle/sealed/mecha/combat/gygax/dark/loaded
 	cost = 80
 
 /datum/uplink_item/support/honker
 	name = "Dark H.O.N.K."
 	desc = "A clown combat mech equipped with bombanana peel and tearstache grenade launchers, as well as the ubiquitous HoNkER BlAsT 5000."
-	item = /obj/mecha/combat/honker/dark/loaded
+	item = /obj/vehicle/sealed/mecha/combat/honker/dark/loaded
 	cost = 80
 	include_modes = list(/datum/game_mode/nuclear/clown_ops)
 
@@ -1162,7 +1162,7 @@ GLOBAL_LIST_INIT(uplink_items, subtypesof(/datum/uplink_item))
 	name = "Mauler Exosuit"
 	desc = "A massive and incredibly deadly military-grade exosuit. Features long-range targeting, thrust vectoring \
 			and deployable smoke. Comes equipped with an LMG, scattershot carbine, missile rack, an antiprojectile armor booster and a Tesla energy array."
-	item = /obj/mecha/combat/marauder/mauler/loaded
+	item = /obj/vehicle/sealed/mecha/combat/marauder/mauler/loaded
 	cost = 140
 
 // Stealth Items