added the functionality of multiple roll dice when all pieces in waiting

Projekte/mdga/client/src/main/java/pp/mdga/client/server/MdgaServer.java

@@ -152,6 +152,7 @@ private void initializeSerializables() {
         Serializer.registerClass(SwapCard.class);
         Serializer.registerClass(ShieldCard.class);
         Serializer.registerClass(HiddenCard.class);
+        Serializer.registerClass(ChoosePieceStateMessage.class);
 
         Serializer.registerClass(Color.class, new EnumSerializer());
         Serializer.registerClass(PieceState.class, new EnumSerializer());