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/executor/ExecutionContext.java
/**
	 * @return
	 */
	public DesignElementHandle getHandle( )
	{
		if ( reportHandles.empty( ) )
		{
			return null;
		}
		return (DesignElementHandle) reportHandles.peek( );
	}
	/**
	 * Adds the exception
	 * 
	 * @param ex
	 *            the Throwable instance
	 */
	public void addException( BirtException ex )
	{
		DesignElementHandle handle = getDesign( );
		if ( design != null )
		{
			handle = design.getHandle( );
		}
		addException( handle, ex );
	}
	protected HashMap elementExceptions = new HashMap( );
	public void addException( DesignElementHandle element, BirtException ex )
	{
		ElementExceptionInfo exInfo = (ElementExceptionInfo) elementExceptions