[MIRROR] Port /datum/status_effect and convert wetness and fire stacks to it (#11666)

Co-authored-by: ShadowLarkens <shadowlarkens@gmail.com>
Co-authored-by: Cameron Lennox <killer65311@gmail.com>

code/game/machinery/computer/arcade.dm

@@ -417,7 +417,7 @@
 				if(emagged)
 					var/mob/living/M = user
 					M.adjust_fire_stacks(5)
-					M.IgniteMob() //flew into a star, so you're on fire
+					M.ignite_mob() //flew into a star, so you're on fire
 					to_chat(user,span_danger(span_large("You feel an immense wave of heat emanate from \the [src]. Your skin bursts into flames.")))
 		dat += "<br><P ALIGN=Right><a href='byond://?src=\ref[src];menu=1'>OK...</a></P>"
 

code/game/machinery/cryo.dm

@@ -301,7 +301,7 @@
 		M.client.eye = src
 	M.stop_pulling()
 	M.loc = src
-	M.ExtinguishMob()
+	M.extinguish_mob()
 	if(M.health > -100 && (M.health < 0 || M.sleeping))
 		to_chat(M, span_boldnotice("You feel a cold liquid surround you. Your skin starts to freeze up."))
 	occupant = M