Refactors Regenerate Organs, and a few organ helpers (#74219)

## About The Pull Request

Refactors regenerate organs to be slightly more intelligent in handling
organ changes and replacements.
Noteably:
- We don't remove organs that were modified by the owner; such as
changing out your heart for a cybernetic
- We early break out of the for loop if they aren't supposed to have an
organ there and remove it
- We check for the organ already being correct, and just healing it and
continuing if it is

Also changes the names of some of the organ helpers into snake_case
### Mapping March
Ckey to receive rewards: N/A

## Why It's Good For The Game
## Changelog

---------

Co-authored-by: Jacquerel <hnevard@gmail.com>

code/modules/paperwork/paperplane.dm

@@ -46,12 +46,12 @@
 	return ..()
 
 /obj/item/paperplane/suicide_act(mob/living/user)
-	var/obj/item/organ/internal/eyes/eyes = user.getorganslot(ORGAN_SLOT_EYES)
+	var/obj/item/organ/internal/eyes/eyes = user.get_organ_slot(ORGAN_SLOT_EYES)
 	user.Stun(200)
 	user.visible_message(span_suicide("[user] jams [src] in [user.p_their()] nose. It looks like [user.p_theyre()] trying to commit suicide!"))
 	user.adjust_eye_blur(12 SECONDS)
 	if(eyes)
-		eyes.applyOrganDamage(rand(6,8))
+		eyes.apply_organ_damage(rand(6,8))
 	sleep(1 SECONDS)
 	return BRUTELOSS
 
@@ -102,13 +102,13 @@
 	if(..() || !ishuman(hit_atom))//if the plane is caught or it hits a nonhuman
 		return
 	var/mob/living/carbon/human/H = hit_atom
-	var/obj/item/organ/internal/eyes/eyes = H.getorganslot(ORGAN_SLOT_EYES)
+	var/obj/item/organ/internal/eyes/eyes = H.get_organ_slot(ORGAN_SLOT_EYES)
 	if(prob(hit_probability))
 		if(H.is_eyes_covered())
 			return
 		visible_message(span_danger("\The [src] hits [H] in the eye[eyes ? "" : " socket"]!"))
 		H.adjust_eye_blur(12 SECONDS)
-		eyes?.applyOrganDamage(rand(6,8))
+		eyes?.apply_organ_damage(rand(6,8))
 		H.Paralyze(40)
 		H.emote("scream")