Fix a small bug that task runners are not correctly registered

simulator/src/main/java/de/rwth/montisim/simulation/simulator/Simulator.java

@@ -169,7 +169,7 @@ public class Simulator implements ISimulator, Updatable {
     @Override
     public void registerTaskRunner(SimulationObject obj, TaskRunner runner) {
         SimulatorState state = (SimulatorState) obj.state;
-        state.updatableId = taskRunners.size();
+        state.taskRunnerId = taskRunners.size();
         taskRunners.add(runner);
     }
 
@@ -183,4 +183,8 @@ public class Simulator implements ISimulator, Updatable {
             System.exit(-1);
         }
     }
+
+    public Vector<Updatable> getUpdatables() {
+        return updatables;
+    }
 }
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