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
protected IReportContent report;
	protected int currentPageNum = 0;
	protected double pageWidth = 0.0d;
	protected double pageHeight = 0.0d;
	private int shapeCount = 0;
	
	protected IReportRunnable reportRunnable;
	/**
	 * The overall report design, defines a set of properties that describe the
	 * design as a whole like author, base and comments etc.
	 */
	protected ReportDesignHandle reportDesign;
	/**
	 * The report context,includes report parameters and configuration values.
	 */
	protected IReportContext context;
	
	protected IEmitterServices services;
	protected float scale;
	protected int hTextSpace = 70;
	protected int vTextSpace = 100;
	protected float lToP;
	
	private final Stack containerStack = new Stack( );
	
	private Map imageNames = new HashMap( );
	
	private Map imageExtensions = new HashMap( );
	
	private Map fileNamesLists = new TreeMap( );