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/PPTEmitter.java
{
		return;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.emitter.IContentEmitter#endList(org.eclipse.birt.report.engine.content.IListContent)
	 */
	public void endList( IListContent list )
	{
		return;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.emitter.IContentEmitter#endListBand(org.eclipse.birt.report.engine.content.IListBandContent)
	 */
	public void endListBand( IListBandContent listBand )
	{
		return;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.engine.emitter.IContentEmitter#endPage(org.eclipse.birt.report.engine.content.IPageContent)
	 */
	public void endPage( IPageContent page )
	{
		if ( render != null )
		{