Fix Event Bus keeping state

The static event bus is dangerous since a simulation will reuse listeners still registered from the previous simulation.

src/main/java/cambio/simulator/EventBus.java

@@ -26,4 +26,11 @@ public static <T extends Schedulable> void subscribe(Class<T> targetClass, Consu
         //noinspection unchecked
         listeners.computeIfAbsent(targetClass, k -> new LinkedList<>()).add((Consumer<Schedulable>) consumer);
     }
+
+    // TODO: This is a hotfix to avoid having a state from one simulation carry over to the next one. Actually,
+    //  static classes are an anti-pattern that should not be used exactly for this reason!
+    public static void clear() {
+        listeners.clear();
+    }
+
 }

src/main/java/cambio/simulator/ExperimentCreator.java

@@ -32,6 +32,7 @@ public class ExperimentCreator {
      * @return a new {@link Experiment} that is configured based on the given config
      */
     public Experiment createSimulationExperiment(ExperimentStartupConfig config) {
+        EventBus.clear();
         String archDescLocation = config.getArchitectureDescLoc();
         String expDescLocation;