Add overload of callSyncedAction with no packet arg for actions that don't need any data (#183)

Author: Zorbatron

src/main/java/com/cleanroommc/modularui/value/sync/PanelSyncManager.java

@@ -329,6 +329,10 @@ public void callSyncedAction(String mapKey, Consumer<PacketBuffer> packetBuilder
         callSyncedAction(mapKey, packet);
     }
 
+    public void callSyncedAction(String mapKey) {
+        callSyncedAction(mapKey, new PacketBuffer(Unpooled.buffer(0)));
+    }
+
     @Override
     public <T extends SyncHandler> T getOrCreateSyncHandler(String name, int id, Class<T> clazz, Supplier<T> supplier) {
         SyncHandler syncHandler = findSyncHandlerNullable(name, id);