[MIRROR] Replaced body zone magic strings with defines (#6004)

* Replaced body zone magic strings with defines

* merge conflicts

code/modules/mob/living/carbon/alien/organs.dm

@@ -30,7 +30,7 @@
 	name = "plasma vessel"
 	icon_state = "plasma"
 	w_class = WEIGHT_CLASS_NORMAL
-	zone = "chest"
+	zone = BODY_ZONE_CHEST
 	slot = "plasmavessel"
 	alien_powers = list(/obj/effect/proc_holder/alien/plant, /obj/effect/proc_holder/alien/transfer)
 
@@ -104,7 +104,7 @@
 /obj/item/organ/alien/hivenode
 	name = "hive node"
 	icon_state = "hivenode"
-	zone = "head"
+	zone = BODY_ZONE_HEAD
 	slot = "hivenode"
 	w_class = WEIGHT_CLASS_TINY
 	var/recent_queen_death = 0 //Indicates if the queen died recently, aliens are heavily weakened while this is active.
@@ -156,7 +156,7 @@
 /obj/item/organ/alien/resinspinner
 	name = "resin spinner"
 	icon_state = "stomach-x"
-	zone = "mouth"
+	zone = BODY_ZONE_PRECISE_MOUTH
 	slot = "resinspinner"
 	alien_powers = list(/obj/effect/proc_holder/alien/resin)
 
@@ -164,7 +164,7 @@
 /obj/item/organ/alien/acid
 	name = "acid gland"
 	icon_state = "acid"
-	zone = "mouth"
+	zone = BODY_ZONE_PRECISE_MOUTH
 	slot = "acidgland"
 	alien_powers = list(/obj/effect/proc_holder/alien/acid)
 
@@ -172,7 +172,7 @@
 /obj/item/organ/alien/neurotoxin
 	name = "neurotoxin gland"
 	icon_state = "neurotox"
-	zone = "mouth"
+	zone = BODY_ZONE_PRECISE_MOUTH
 	slot = "neurotoxingland"
 	alien_powers = list(/obj/effect/proc_holder/alien/neurotoxin)
 
@@ -180,7 +180,7 @@
 /obj/item/organ/alien/eggsac
 	name = "egg sac"
 	icon_state = "eggsac"
-	zone = "groin"
+	zone = BODY_ZONE_PRECISE_GROIN
 	slot = "eggsac"
 	w_class = WEIGHT_CLASS_BULKY
 	alien_powers = list(/obj/effect/proc_holder/alien/lay_egg)

code/modules/mob/living/carbon/alien/special/alien_embryo.dm

@@ -56,7 +56,7 @@
 
 	if(stage == 5 && prob(50))
 		for(var/datum/surgery/S in owner.surgeries)
-			if(S.location == "chest" && istype(S.get_surgery_step(), /datum/surgery_step/manipulate_organs))
+			if(S.location == BODY_ZONE_CHEST && istype(S.get_surgery_step(), /datum/surgery_step/manipulate_organs))
 				AttemptGrow(0)
 				return
 		AttemptGrow()

code/modules/mob/living/carbon/alien/special/facehugger.dm

@@ -131,7 +131,7 @@
 			return FALSE
 		var/mob/living/carbon/target = M
 		// gotta have a head to be implanted (no changelings or sentient plants)
-		if(!target.get_bodypart("head"))
+		if(!target.get_bodypart(BODY_ZONE_HEAD))
 			return FALSE
 
 		if(target.getorgan(/obj/item/organ/alien/hivenode) || target.getorgan(/obj/item/organ/body_egg/alien_embryo))
@@ -208,7 +208,7 @@
 		Die()
 		icon_state = "[initial(icon_state)]_impregnated"
 
-		var/obj/item/bodypart/chest/LC = target.get_bodypart("chest")
+		var/obj/item/bodypart/chest/LC = target.get_bodypart(BODY_ZONE_CHEST)
 		if((!LC || LC.status != BODYPART_ROBOTIC) && !target.getorgan(/obj/item/organ/body_egg/alien_embryo))
 			new /obj/item/organ/body_egg/alien_embryo(target)