Ports reftracking from TG.

code/modules/admin/view_variables/topic_basic.dm

@@ -45,6 +45,16 @@
 			usr.client.admin_delete(target)
 			if (isturf(src))	// show the turf that took its place
 				usr.client.debug_variables(src)
+				return
+	#ifdef REFERENCE_TRACKING
+	if(href_list[VV_HK_VIEW_REFERENCES])
+		var/datum/D = locate(href_list[VV_HK_TARGET])
+		if(!D)
+			to_chat(usr, "<span class='warning'>Unable to locate item.</span>")
+			return
+		usr.client.holder.view_refs(target)
+		return
+	#endif
 	if(href_list[VV_HK_MARK])
 		usr.client.mark_datum(target)
 	if(href_list[VV_HK_ADDCOMPONENT])