Bug 180249 BPS39 - Centralized Chart Engine API
Centralized and clearer Engine API -Create one single entry point class ChartEngine in an api package so it's easy to find (with access to IGenerator, Serializer, Device Renderers) -Create a new IGenerator interface instead of exposing the Generator class.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/factory/Generator.java
static final int WITH_AXES = 1;
	/**
	 * Internally used to maintain type information.
	 */
	static final int WITHOUT_AXES = 2;
	/**
	 * An internal style processor.
	 */
	private IStyleProcessor implicitProcessor;
	/**
	 * The internal singleton Generator reference created lazily.
	 */
	private static Generator g = null;
	private static ILogger logger = Logger.getLogger( "org.eclipse.birt.chart.engine/factory" ); 
	/**
	 * A private constructor.
	 */
	private Generator( )
	{
		implicitProcessor = SimpleProcessor.instance( );
	}
	/**
	 * Returns a singleton instance of the chart generator.
	 * 
	 * @return A singleton instance for the chart generator.
	 */
	public static synchronized final Generator instance( )
	{
		if ( g == null )
		{