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>Insets</b></em>' containment reference.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int CLIENT_AREA__INSETS = 3;
	/**
	 * The number of structural features of the '<em>Client Area</em>' class.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int CLIENT_AREA_FEATURE_COUNT = 4;
	/**
	 * The meta object id for the '{@link org.eclipse.birt.chart.model.layout.impl.LabelBlockImpl <em>Label Block</em>}' class.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @see org.eclipse.birt.chart.model.layout.impl.LabelBlockImpl
	 * @see org.eclipse.birt.chart.model.layout.impl.LayoutPackageImpl#getLabelBlock()
	 * @generated
	 */
	int LABEL_BLOCK = 2;
	/**
	 * The feature id for the '<em><b>Children</b></em>' containment reference list.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int LABEL_BLOCK__CHILDREN = BLOCK__CHILDREN;
	/**
	 * The feature id for the '<em><b>Bounds</b></em>' containment reference.