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/client/preferences/_preference.dm

@@ -105,6 +105,10 @@ GLOBAL_LIST_INIT(preference_entries_by_key, init_preference_entries_by_key())
 	/// will show the feature as selectable.
 	var/relevant_species_trait = null
 
+	/// If the selected species has this in its /datum/species/var/external_organs,
+	/// will show the feature as selectable.
+	var/relevant_external_organ = null
+
 /// Called on the saved input when retrieving.
 /// Also called by the value sent from the user through UI. Do not trust it.
 /// Input is the value inside the savefile, output is to tell other code
@@ -318,7 +322,7 @@ GLOBAL_LIST_INIT(preference_entries_by_key, init_preference_entries_by_key())
 	SHOULD_CALL_PARENT(TRUE)
 	SHOULD_NOT_SLEEP(TRUE)
 
-	if (!isnull(relevant_mutant_bodypart) || !isnull(relevant_species_trait))
+	if (!isnull(relevant_mutant_bodypart) || !isnull(relevant_species_trait) || !isnull(relevant_external_organ))
 		var/species_type = preferences.read_preference(/datum/preference/choiced/species)
 
 		var/datum/species/species = new species_type

code/modules/client/preferences/species_features/basic.dm

@@ -34,7 +34,7 @@
 	if(!hetero)
 		target.eye_color_right = value
 
-	var/obj/item/organ/eyes/eyes_organ = target.getorgan(/obj/item/organ/eyes)
+	var/obj/item/organ/internal/eyes/eyes_organ = target.getorgan(/obj/item/organ/internal/eyes)
 	if (!eyes_organ || !istype(eyes_organ))
 		return
 

code/modules/client/preferences/species_features/felinid.dm

@@ -3,13 +3,13 @@
 	savefile_identifier = PREFERENCE_CHARACTER
 	category = PREFERENCE_CATEGORY_SECONDARY_FEATURES
 	can_randomize = FALSE
-	relevant_mutant_bodypart = "tail_human"
+	relevant_external_organ = /obj/item/organ/external/tail/cat
 
 /datum/preference/choiced/tail_human/init_possible_values()
 	return assoc_to_keys(GLOB.tails_list_human)
 
 /datum/preference/choiced/tail_human/apply_to_human(mob/living/carbon/human/target, value)
-	target.dna.features["tail_human"] = value
+	target.dna.features["tail_cat"] = value
 
 /datum/preference/choiced/tail_human/create_default_value()
 	var/datum/sprite_accessory/tails/human/cat/tail = /datum/sprite_accessory/tails/human/cat

code/modules/client/preferences/species_features/lizard.dm

@@ -131,10 +131,14 @@
 	savefile_key = "feature_lizard_tail"
 	savefile_identifier = PREFERENCE_CHARACTER
 	category = PREFERENCE_CATEGORY_SECONDARY_FEATURES
-	relevant_mutant_bodypart = "tail_lizard"
+	relevant_external_organ = /obj/item/organ/external/tail/lizard
 
 /datum/preference/choiced/lizard_tail/init_possible_values()
 	return assoc_to_keys(GLOB.tails_list_lizard)
 
 /datum/preference/choiced/lizard_tail/apply_to_human(mob/living/carbon/human/target, value)
 	target.dna.features["tail_lizard"] = value
+
+/datum/preference/choiced/lizard_tail/create_default_value()
+	var/datum/sprite_accessory/tails/lizard/smooth/tail = /datum/sprite_accessory/tails/lizard/smooth
+	return initial(tail.name)

code/modules/client/verbs/suicide.dm

@@ -7,7 +7,7 @@
 
 /mob/living/carbon/set_suicide(suicide_state) //you thought that box trick was pretty clever, didn't you? well now hardmode is on, boyo.
 	. = ..()
-	var/obj/item/organ/brain/B = getorganslot(ORGAN_SLOT_BRAIN)
+	var/obj/item/organ/internal/brain/B = getorganslot(ORGAN_SLOT_BRAIN)
 	if(B)
 		B.suicided = suicide_state
 
@@ -85,7 +85,7 @@
 		var/suicide_message
 
 		if(!combat_mode)
-			var/obj/item/organ/brain/userbrain = getorgan(/obj/item/organ/brain)
+			var/obj/item/organ/internal/brain/userbrain = getorgan(/obj/item/organ/internal/brain)
 			if(userbrain?.damage >= 75)
 				suicide_message = "[src] pulls both arms outwards in front of [p_their()] chest and pumps them behind [p_their()] back, repeats this motion in a smaller range of motion \
 						down to [p_their()] hips two times once more all while sliding [p_their()] legs in a faux walking motion, claps [p_their()] hands together \