Use the notify name string instead of going via an enum and change

existing hooks to use notifys instead.

resize.c

@@ -156,6 +156,6 @@ recalculate_sizes(void)
 		}
 
 		server_redraw_window(w);
-		notify_window_layout_changed(w);
+		notify_window("window-layout-changed", w);
 	}
 }