Port set_stat and COMSIG_MOB_STATCHANGE from TG

code/modules/mob/living/brain/MMI.dm

@@ -75,7 +75,7 @@
 		brainmob.forceMove(src)
 		brainmob.container = src
 		if(!(newbrain.organ_flags & ORGAN_FAILING)) // the brain organ hasn't been beaten to death.
-			brainmob.stat = CONSCIOUS //we manually revive the brain mob
+			brainmob.set_stat(CONSCIOUS) //we manually revive the brain mob
 			brainmob.remove_from_dead_mob_list()
 			brainmob.add_to_alive_mob_list()
 
@@ -112,7 +112,7 @@
 	if(brain.brainmob)
 		brainmob.container = null //Reset brainmob mmi var.
 		brainmob.forceMove(brain) //Throw mob into brain.
-		brainmob.stat = DEAD
+		brainmob.set_stat(DEAD)
 		brainmob.emp_damage = 0
 		brainmob.reset_perspective() //so the brainmob follows the brain organ instead of the mmi. And to update our vision
 		brain.brainmob = brainmob //Set the brain to use the brainmob

code/modules/mob/living/brain/death.dm

@@ -1,7 +1,7 @@
 /mob/living/brain/death(gibbed)
 	if(stat == DEAD)
 		return
-	stat = DEAD
+	set_stat(DEAD)
 
 	if(!gibbed && container)//If not gibbed but in a container.
 		var/obj/item/mmi = container

code/modules/mob/living/brain/posibrain.dm

@@ -135,7 +135,7 @@ GLOBAL_VAR(posibrain_notify_cooldown)
 			brainmob.stored_dna = new /datum/dna/stored(brainmob)
 		C.dna.copy_dna(brainmob.stored_dna)
 	brainmob.timeofhostdeath = C.timeofdeath
-	brainmob.stat = CONSCIOUS
+	brainmob.set_stat(CONSCIOUS)
 	if(brainmob.mind)
 		brainmob.mind.assigned_role = new_role
 	if(C.mind)
@@ -158,7 +158,7 @@ GLOBAL_VAR(posibrain_notify_cooldown)
 	name = "[initial(name)] ([brainmob.name])"
 	to_chat(brainmob, welcome_message)
 	brainmob.mind.assigned_role = new_role
-	brainmob.stat = CONSCIOUS
+	brainmob.set_stat(CONSCIOUS)
 	brainmob.remove_from_dead_mob_list()
 	brainmob.add_to_alive_mob_list()