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
* @ordered
	 */
	int PLOT__HORIZONTAL_SPACING = BLOCK_FEATURE_COUNT + 0;
	/**
	 * The feature id for the '<em><b>Vertical Spacing</b></em>' attribute.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int PLOT__VERTICAL_SPACING = BLOCK_FEATURE_COUNT + 1;
	/**
	 * The feature id for the '<em><b>Client Area</b></em>' containment reference.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int PLOT__CLIENT_AREA = BLOCK_FEATURE_COUNT + 2;
	/**
	 * The number of structural features of the '<em>Plot</em>' class.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 * @ordered
	 */
	int PLOT_FEATURE_COUNT = BLOCK_FEATURE_COUNT + 3;
	/**
	 * The meta object id for the '{@link org.eclipse.birt.chart.model.layout.impl.TitleBlockImpl <em>Title Block</em>}' class.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @see org.eclipse.birt.chart.model.layout.impl.TitleBlockImpl
	 * @see org.eclipse.birt.chart.model.layout.impl.LayoutPackageImpl#getTitleBlock()
	 * @generated