 Returns the "change" state for this set of macros.
	 * The "change" state represents whether the macros were changed or not.
	 * This state is not reset when the serialize() method is called
	 * Users can use this state to monitor whether the macros were changed or not.
	 * The "change" state can be reset only by calling the setChanged(false) method
 Returns the "change" state for this set of macros.
	 * The "change" state represents whether the macros were changed or not.
	 * This state is not reset when the serialize() method is called
	 * Users can use this state to monitor whether the macros were changed or not.
	 * The "change" state can be reset only by calling the setChanged(false) method | StorableCdtVariables.java