Bug 117149 Add additional datapoint markers
I would like to propose adding additional datapoint markers. Attached is a set of markers I would like supported.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/model/attribute/MarkerType.java
public static final MarkerType ICON_LITERAL = new MarkerType( ICON,
			"Icon", "Icon" ); 
	/**
	 * An array of all the '<em><b>Marker Type</b></em>' enumerators. <!--
	 * begin-user-doc --> <!-- end-user-doc -->
	 * 
	 * @generated
	 */
	private static final MarkerType[] VALUES_ARRAY = new MarkerType[]{
			CROSSHAIR_LITERAL,
			TRIANGLE_LITERAL,
			BOX_LITERAL,
			CIRCLE_LITERAL,
			ICON_LITERAL,
	};
	/**
	 * A public read-only list of all the '<em><b>Marker Type</b></em>' enumerators.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public static final List VALUES = Collections.unmodifiableList( Arrays.asList( VALUES_ARRAY ) );
	/**
	 * Returns the '<em><b>Marker Type</b></em>' literal with the specified literal value.
	 * <!-- begin-user-doc --> <!-- end-user-doc -->
	 * @generated
	 */
	public static MarkerType get( String literal )
	{
		for ( int i = 0; i < VALUES_ARRAY.length; ++i )
		{