[MIRROR] Changing changeling (Refactor) (#11142)

Co-authored-by: Cameron Lennox <killer65311@gmail.com>
Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>

code/datums/mind.dm

@@ -31,6 +31,8 @@
 	var/assigned_role
 	var/special_role
 
+	var/datum/antag_holder/antag_holder
+
 	var/role_alt_title
 
 	var/datum/job/assigned_job
@@ -41,7 +43,6 @@
 	var/has_been_rev = 0//Tracks if this mind has been a rev or not
 
 	var/datum/faction/faction 			//associated faction
-	var/datum/changeling/changeling		//changeling holder
 
 	var/rev_cooldown = 0
 	var/tcrystals = 0
@@ -70,15 +71,18 @@
 /datum/mind/New(var/key)
 	src.key = key
 	purchase_log = list()
+	antag_holder = new
 	..()
 
 /datum/mind/proc/transfer_to(mob/living/new_character, force = FALSE)
 	if(!istype(new_character))
 		to_world_log("## DEBUG: transfer_to(): Some idiot has tried to transfer_to() a non mob/living mob. Please inform Carn")
-	if(current)					//remove ourself from our old body's mind variable
-		if(changeling)
+	var/datum/component/antag/changeling/comp
+	if(current)
+		comp = is_changeling(current)			//remove ourself from our old body's mind variable
+		if(comp)
 			current.remove_changeling_powers()
-			remove_verb(current, /datum/changeling/proc/EvolutionMenu)
+			remove_verb(current, /mob/proc/EvolutionMenu)
 		current.mind = null
 
 	if(new_character.mind)		//remove any mind currently in our new body's mind variable
@@ -87,7 +91,7 @@
 	current = new_character		//link ourself to our new body
 	new_character.mind = src	//and link our new body to ourself
 
-	if(changeling)
+	if(comp)
 		new_character.make_changeling()
 
 	if(active || force)
@@ -471,7 +475,7 @@
 	role_alt_title =  null
 	assigned_job =    null
 	//faction =       null //Uncommenting this causes a compile error due to 'undefined type', fucked if I know.
-	changeling =      null
+	//changeling =    null //TODO: Figure out where this is all used and move it from mind to mob.
 	initial_account = null
 	objectives =      list()
 	special_verbs =   list()