[New] added TimeVariable.clear()-method

Can be used to remove all currently existing TimedValues

li.strolch.model/src/main/java/li/strolch/model/timevalue/ITimeVariable.java

@@ -84,6 +84,11 @@ public interface ITimeVariable<T extends IValue> {
 	 */
 	void compact();
 
+	/**
+	 * Clears all values on this time variable
+	 */
+	void clear();
+
 	/**
 	 * @return a copy of this time variable
 	 */

li.strolch.model/src/main/java/li/strolch/model/timevalue/impl/TimeVariable.java

@@ -118,6 +118,11 @@ public class TimeVariable<T extends IValue> implements ITimeVariable<T>, Seriali
 		}
 	}
 
+	@Override
+	public void clear() {
+		this.container.clear();
+	}
+
 	@Override
 	public ITimeVariable<T> getCopy() {
 		TimeVariable<T> clone = new TimeVariable<>();