Move the handle_changeling proc to a signal

code/__DEFINES/components.dm

@@ -155,6 +155,7 @@
 
 // /mob/living/carbon signals
 #define COMSIG_CARBON_SOUNDBANG "carbon_soundbang"					//from base of mob/living/carbon/soundbang_act(): (list(intensity))
+#define COMSIG_CARBON_LIFE "carbon_life"							//from base of mob/living/carbon/Life() ()
 
 // /mob/living/simple_animal/hostile signals
 #define COMSIG_HOSTILE_ATTACKINGTARGET "hostile_attackingtarget"

code/game/gamemodes/changeling/evolution_menu.dm

@@ -383,6 +383,9 @@ var/list/sting_paths
 	var/mob/living/carbon/C = src		//only carbons have dna now, so we have to typecaste
 	mind.changeling.absorbed_dna |= C.dna.Clone()
 	mind.changeling.trim_dna()
+
+	RegisterSignal(C, COMSIG_CARBON_LIFE, CALLBACK(C, /mob/living/carbon/.proc/handle_changeling))
+
 	return 1
 
 //Used to dump the languages from the changeling datum into the actual mob.
@@ -421,6 +424,8 @@ var/list/sting_paths
 		if(hud_used)
 			hud_used.lingstingdisplay.icon_state = null
 			hud_used.lingstingdisplay.invisibility = 101
+			hud_used.lingchemdisplay.invisibility = 101
+		UnregisterSignal(src, COMSIG_CARBON_LIFE)
 
 /datum/changeling/proc/has_sting(datum/action/power)
 	for(var/datum/action/P in purchasedpowers)

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

@@ -13,13 +13,13 @@
 		for(var/obj/item/organ/internal/O in internal_organs)
 			O.on_life()
 
-	handle_changeling()
 	handle_wetness(times_fired)
 
 	// Increase germ_level regularly
 	if(germ_level < GERM_LEVEL_AMBIENT && prob(30))	//if you're just standing there, you shouldn't get more germs beyond an ambient level
 		germ_level++
 
+	SEND_SIGNAL(src, COMSIG_CARBON_LIFE, seconds, times_fired)
 
 ///////////////
 // BREATHING //