Allow admins to drag-drop ghosts into mobs

This allows administrators to drag their mouse from a ghost to a type of
/mob/living, which will then prompt them if they wish to put that ghost in
control of the mob, and obviously, that is exactly what happens if you
select yes.

code/modules/mob/dead/observer/observer.dm

@@ -487,6 +487,14 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 
 	src << browse(dat, "window=manifest;size=370x420;can_close=1")
 
+//this is called when a ghost is drag clicked to something.
+/mob/dead/observer/MouseDrop(atom/over)
+	if (isobserver(usr) && usr.client && usr.client.holder && isliving(over))
+		if (usr.client.holder.cmd_ghost_drag(src,over))
+			return
+
+	return ..()
+
 //BEGIN TELEPORT HREF CODE
 /mob/dead/observer/Topic(href, href_list)
 	if(usr != src)