This tail refactor turned into an organ refactor. Funny how that works. (#67017)

* Fuck you (refactors ur tails)

* Errors

* Wow. Pain.

* Fixes up probably everything

* finish up here

* Fixes hard del maybe

* original owner hard del

* garbage collection runtime

* suck my peen byond

* Mapped tails

* motherfucker.

* motherrfucker. again.

* Whooopppppsie

* yeah bad idea

* Turns out external organs literally just sat in nullspace forever if their parent was deleted, and didnt Remove() themselves, causing harddels.

* So anyways I repathed all organs

* Fixes

* really.

* unit test... test

* unit test-test but it passes linters this time because im a moh-ron

* I've lost track of what im doing at this point

* Hopefully fixes hard del?

* meh

* Update code/datums/dna.dm

* things n stuff

* repath from master pull

code/modules/unit_tests/metabolizing.dm

@@ -79,7 +79,7 @@
 	pill.attack(pill_user, pill_user)
 
 	// Set the metabolism efficiency to 1.0 so it transfers all reagents to the body in one go.
-	var/obj/item/organ/stomach/pill_belly = pill_user.getorganslot(ORGAN_SLOT_STOMACH)
+	var/obj/item/organ/internal/stomach/pill_belly = pill_user.getorganslot(ORGAN_SLOT_STOMACH)
 	pill_belly.metabolism_efficiency = 1
 
 	pill_user.Life()

code/modules/unit_tests/stomach.dm

@@ -5,7 +5,7 @@
 
 	var/mob/living/carbon/human/human = allocate(/mob/living/carbon/human)
 	var/obj/item/food/hotdog/debug/fooditem = allocate(/obj/item/food/hotdog/debug)
-	var/obj/item/organ/stomach/belly = human.getorganslot(ORGAN_SLOT_STOMACH)
+	var/obj/item/organ/internal/stomach/belly = human.getorganslot(ORGAN_SLOT_STOMACH)
 	var/obj/item/reagent_containers/pill/pill = allocate(/obj/item/reagent_containers/pill)
 	var/datum/reagent/drug/methamphetamine/meth = /datum/reagent/drug/methamphetamine