Adds regenerate_organs proc and adds it to relevant regeneration code (#22740)

* Adds regenerate_organs proc to carbon and adds it to relevant regeneration code

I simply took the bit from the admin heal and made it into a proc and
added it to the necessary regeneration-related bits of code.

* Adds regenerate organs back to fully heal

For some reason this didn't get included in the previous commit.

* moves regenerate_organs to organ_internal

As suggested. It fits better here, anyways.

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

@@ -688,6 +688,7 @@
 			D.cure(0)
 	if(admin_revive)
 		regenerate_limbs()
+		regenerate_organs()
 		handcuffed = initial(handcuffed)
 		for(var/obj/item/weapon/restraints/R in contents) //actually remove cuffs from inventory
 			qdel(R)

code/modules/mob/living/carbon/human/human.dm

@@ -823,31 +823,9 @@
 				hud_used.healthdoll.icon_state = "healthdoll_DEAD"
 
 /mob/living/carbon/human/fully_heal(admin_revive = 0)
-
 	if(admin_revive)
 		regenerate_limbs()
-
-		if(!(NOBREATH in dna.species.species_traits) && !getorganslot("lungs"))
-			var/obj/item/organ/lungs/L = new()
-			L.Insert(src)
-
-		if(!(NOBLOOD in dna.species.species_traits) && !getorganslot("heart"))
-			var/obj/item/organ/heart/H = new()
-			H.Insert(src)
-
-		if(!getorganslot("tongue"))
-			var/obj/item/organ/tongue/T
-
-			for(var/tongue_type in dna.species.mutant_organs)
-				if(ispath(tongue_type, /obj/item/organ/tongue))
-					T = new tongue_type()
-					T.Insert(src)
-
-			// if they have no mutant tongues, give them a regular one
-			if(!T)
-				T = new()
-				T.Insert(src)
-
+		regenerate_organs()
 	remove_all_embedded_objects()
 	drunkenness = 0
 	for(var/datum/mutation/human/HM in dna.mutations)