Bug 183733 Implement the IScriptOjectClassInfo to provide the class infromation to support the JS code assistant.
Engine should implement the IScriptObjectClassInfo interface to return the class information for script object.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/script/internal/CellScriptExecutor.java
{
	public static void handleOnPrepare( CellHandle cellHandle,
			ExecutionContext context )
	{
		try
		{
			ICell cell = new Cell( cellHandle );
			if ( handleJS( cell, cellHandle.getOnPrepare( ), context ).didRun( ) )
				return;
			ICellEventHandler eh = getEventHandler( cellHandle, context );
			if ( eh != null )
				eh.onPrepare( cell, context.getReportContext( ) );
		} catch ( Exception e )
		{
			addException( context, e );
		}
	}
	public static void handleOnCreate( ICellContent content,
			ExecutionContext context, boolean fromGrid )
	{
		try
		{
			Object generateBy = content.getGenerateBy( );
			if ( generateBy == null )
			{