The death or internal/external organ pathing (ft. fixed fox ears and recoloring bodypart overlays with dye sprays) (#87434)

## About The Pull Request
This PR kills the abstract internal and external typepaths for organs,
now replaced by an EXTERNAL_ORGAN flag to distinguish the two kinds.

This PR also fixes fox ears (from #87162, no tail is added) and
mushpeople's caps (they should be red, the screenshot is a tad
outdated).

And yes, you can now use a hair dye spray to recolor body parts like
most tails, podpeople hair, mushpeople caps and cat ears. The process
can be reversed by using the spray again.

## Why It's Good For The Game
Time-Green put some effort during the last few months to untie functions
and mechanics from external/internal organ pathing. Now, all that this
pathing is good for are a few typechecks, easily replaceable with
bitflags.

Also podpeople and mushpeople need a way to recolor their "hair". This
kind of applies to fish tails from the fish infusion, which colors can't
be selected right now. The rest is just there if you ever want to
recolor your lizard tail for some reason.

Proof of testing btw (screenshot taken before mushpeople cap fix, right
side has dyed body parts, moth can't be dyed, they're already fabolous):

![immagine](https://github.com/user-attachments/assets/2bb625c9-9233-42eb-b9b8-e0bd6909ce89)

## Changelog

🆑
code: Removed internal/external pathing from organs in favor of a bit
flag. Hopefully this shouldn't break anything about organs.
fix: Fixed invisible fox ears.
fix: Fixed mushpeople caps not being colored red by default.
add: You can now dye most tails, podpeople hair, mushpeople caps etc.
with a hair dye spray.
/🆑

code/modules/wiremod/shell/brain_computer_interface.dm

@@ -1,4 +1,4 @@
-/obj/item/organ/internal/cyberimp/bci
+/obj/item/organ/cyberimp/bci
 	name = "brain-computer interface"
 	desc = "An implant that can be placed in a user's head to control circuits using their brain."
 	icon = 'icons/obj/science/circuits.dmi'
@@ -6,7 +6,7 @@
 	zone = BODY_ZONE_HEAD
 	w_class = WEIGHT_CLASS_TINY
 
-/obj/item/organ/internal/cyberimp/bci/Initialize(mapload)
+/obj/item/organ/cyberimp/bci/Initialize(mapload)
 	. = ..()
 
 	RegisterSignal(src, COMSIG_CIRCUIT_ACTION_COMPONENT_REGISTERED, PROC_REF(action_comp_registered))
@@ -19,7 +19,7 @@
 		new /obj/item/circuit_component/bci_core,
 	), SHELL_CAPACITY_SMALL, starting_circuit = circuit)
 
-/obj/item/organ/internal/cyberimp/bci/say(
+/obj/item/organ/cyberimp/bci/say(
 	message,
 	bubble_type,
 	list/spans = list(),
@@ -43,11 +43,11 @@
 
 	return ..()
 
-/obj/item/organ/internal/cyberimp/bci/proc/action_comp_registered(datum/source, obj/item/circuit_component/equipment_action/action_comp)
+/obj/item/organ/cyberimp/bci/proc/action_comp_registered(datum/source, obj/item/circuit_component/equipment_action/action_comp)
 	SIGNAL_HANDLER
 	LAZYADD(actions, new/datum/action/innate/bci_action(src, action_comp))
 
-/obj/item/organ/internal/cyberimp/bci/proc/action_comp_unregistered(datum/source, obj/item/circuit_component/equipment_action/action_comp)
+/obj/item/organ/cyberimp/bci/proc/action_comp_unregistered(datum/source, obj/item/circuit_component/equipment_action/action_comp)
 	SIGNAL_HANDLER
 	var/datum/action/innate/bci_action/action = action_comp.granted_to[REF(src)]
 	if(!istype(action))
@@ -61,10 +61,10 @@
 	check_flags = AB_CHECK_CONSCIOUS
 	button_icon_state = "bci_power"
 
-	var/obj/item/organ/internal/cyberimp/bci/bci
+	var/obj/item/organ/cyberimp/bci/bci
 	var/obj/item/circuit_component/equipment_action/circuit_component
 
-/datum/action/innate/bci_action/New(obj/item/organ/internal/cyberimp/bci/_bci, obj/item/circuit_component/equipment_action/circuit_component)
+/datum/action/innate/bci_action/New(obj/item/organ/cyberimp/bci/_bci, obj/item/circuit_component/equipment_action/circuit_component)
 	..()
 	bci = _bci
 	circuit_component.granted_to[REF(_bci)] = src
@@ -95,7 +95,7 @@
 
 	var/datum/weakref/user
 
-	var/obj/item/organ/internal/cyberimp/bci/bci
+	var/obj/item/organ/cyberimp/bci/bci
 
 /obj/item/circuit_component/bci_core/populate_ports()
 
@@ -290,7 +290,7 @@
 	var/busy_icon_state
 	var/locked = FALSE
 
-	var/obj/item/organ/internal/cyberimp/bci/bci_to_implant
+	var/obj/item/organ/cyberimp/bci/bci_to_implant
 
 	COOLDOWN_DECLARE(message_cooldown)
 
@@ -365,13 +365,13 @@
 	return SECONDARY_ATTACK_CANCEL_ATTACK_CHAIN
 
 /obj/machinery/bci_implanter/attackby(obj/item/weapon, mob/user, params)
-	var/obj/item/organ/internal/cyberimp/bci/new_bci = weapon
+	var/obj/item/organ/cyberimp/bci/new_bci = weapon
 	if (istype(new_bci))
 		if (!(locate(/obj/item/integrated_circuit) in new_bci))
 			balloon_alert(user, "bci has no circuit!")
 			return
 
-		var/obj/item/organ/internal/cyberimp/bci/previous_bci_to_implant = bci_to_implant
+		var/obj/item/organ/cyberimp/bci/previous_bci_to_implant = bci_to_implant
 
 		user.transferItemToLoc(weapon, src)
 		bci_to_implant = weapon
@@ -428,7 +428,7 @@
 
 	playsound(loc, 'sound/machines/ping.ogg', 30, FALSE)
 
-	var/obj/item/organ/internal/cyberimp/bci/bci_organ = carbon_occupant.get_organ_by_type(/obj/item/organ/internal/cyberimp/bci)
+	var/obj/item/organ/cyberimp/bci/bci_organ = carbon_occupant.get_organ_by_type(/obj/item/organ/cyberimp/bci)
 
 	if (bci_organ)
 		bci_organ.Remove(carbon_occupant)
@@ -460,7 +460,7 @@
 
 	var/mob/living/carbon/carbon_occupant = occupant
 	if (istype(occupant))
-		var/obj/item/organ/internal/cyberimp/bci/bci_organ = carbon_occupant.get_organ_by_type(/obj/item/organ/internal/cyberimp/bci)
+		var/obj/item/organ/cyberimp/bci/bci_organ = carbon_occupant.get_organ_by_type(/obj/item/organ/cyberimp/bci)
 		if (isnull(bci_organ) && isnull(bci_to_implant))
 			say("No brain-computer interface inserted, and occupant does not have one. Insert a BCI to implant one.")
 			playsound(src, 'sound/machines/buzz/buzz-sigh.ogg', 30, TRUE)