[New] added IActivityElement.asAction and .asActivity

li.strolch.model/src/main/java/li/strolch/model/activity/Activity.java

@@ -483,6 +483,11 @@ public class Activity extends AbstractStrolchRootElement
 		return this.elements.entrySet().stream();
 	}
 
+	@Override
+	public Activity asActivity() {
+		return this;
+	}
+
 	@Override
 	public Long getStart() {
 		long start = Long.MAX_VALUE;

li.strolch.model/src/main/java/li/strolch/model/activity/IActivityElement.java

@@ -188,4 +188,22 @@ public interface IActivityElement extends StrolchElement {
 
 		return parent;
 	}
+
+	/**
+	 * Casts this {@link IActivityElement} to {@link Activity}
+	 *
+	 * @return this {@link IActivityElement} as {@link Activity}
+	 */
+	default Activity asActivity() {
+		return (Activity) this;
+	}
+
+	/**
+	 * Casts this {@link IActivityElement} to {@link Action}
+	 *
+	 * @return this {@link IActivityElement} as {@link Action}
+	 */
+	default Action asAction() {
+		return (Action) this;
+	}
 }