Bug 207268 Add visibility option for plot within axes
For chart with axes, we should make plot within axes invisible. Meantime, other plots, such as axes, legend and title, should be visible. This enhancement doesn't include UI change, and it is required for cross tab integration.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/layout/LayoutPackage.java
/**
	 * The feature id for the '<em><b>Title Position</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int LEGEND__TITLE_POSITION = BLOCK_FEATURE_COUNT + 10;
	/**
	 * The feature id for the '<em><b>Show Value</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int LEGEND__SHOW_VALUE = BLOCK_FEATURE_COUNT + 11;
	/**
	 * The feature id for the '<em><b>Show Percent</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int LEGEND__SHOW_PERCENT = BLOCK_FEATURE_COUNT + 12;
	/**
	 * The feature id for the '<em><b>Show Total</b></em>' attribute.
	 * <!-- begin-user-doc -->
	 * <!-- end-user-doc -->
	 * @generated
	 * @ordered