Replaces HEALS_EARS_2 with a component, adds a wearertargeting parent component for future use (#37530)

code: HEALS_EARS_2 is removed in favor of the earhealing component

code: wearertargeting component is available to subtype for components that want to target the wearer of an item rather than the item itself

code/datums/components/wearertargeting.dm

@@ -0,0 +1,26 @@
+// A dummy parent type used for easily making components that target an item's wearer rather than the item itself.
+
+/datum/component/wearertargeting
+	var/datum/component/mobhook
+	var/list/valid_slots = list()
+	var/list/signals = list()
+	var/datum/callback/callback = CALLBACK(GLOBAL_PROC, .proc/pass)
+	var/mobtype = /mob/living
+
+/datum/component/wearertargeting/Initialize()
+	if(!isitem(parent))
+		return COMPONENT_INCOMPATIBLE
+	RegisterSignal(list(COMSIG_ITEM_EQUIPPED, COMSIG_ITEM_DROPPED), .proc/checkMobHook)
+
+/datum/component/wearertargeting/Destroy()
+	QDEL_NULL(mobhook)
+	return ..()
+
+/datum/component/wearertargeting/proc/checkMobHook(mob/user, slot)
+	if ((slot in valid_slots) && istype(user, mobtype))
+		if (mobhook && mobhook.parent != user)
+			QDEL_NULL(mobhook)
+		if (!mobhook)
+			mobhook = user.AddComponent(/datum/component/redirect, signals, callback)
+	else
+		QDEL_NULL(mobhook)