Bug 194371 Use page emitter framework to implement ppt emitter.
In order to keep consistent with pdf and postscript, ppt need to use page emitter framework.
engine/org.eclipse.birt.report.engine.emitter.ppt/src/org/eclipse/birt/report/engine/emitter/ppt/PPTRender.java
/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.layout.area.IAreaVisitor#visitImage(org.eclipse.birt.report.engine.layout.area.IImageArea)
	 */
	public void visitImage( IImageArea imageArea )
	{
		drawImage( imageArea );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.layout.area.IAreaVisitor#visitAutoText(org.eclipse.birt.report.engine.layout.area.ITemplateArea)
	 */
	public void visitAutoText( ITemplateArea templateArea )
	{