implemented GUI update on cloning items

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

bus/src/main/java/de/srsoftware/umbrella/messagebus/MessageBus.java

@@ -12,7 +12,7 @@ public class MessageBus {
 
 	private MessageBus(){}
 
-	public void dispatch(Event event){
+	public void dispatch(Event<?> event){
 		new Thread(() -> { // TODO: use thread pool
 			try {
 				Thread.sleep(100);