Bug 148588 Image Builder enhancement
1.Image selector should not filter *.svg 2.Support svg image type in embedded image.
UI/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/ImageManager.java
{
	private static final String EMBEDDED_SUFFIX = ".Embedded."; 
	private static final ImageManager instance = new ImageManager( );
	private List invalidUrlList = new ArrayList( );
	private ImageManager( )
	{
	}
	/**
	 * Gets the instance of the image manager
	 * 
	 * @return Returns the instanceof the image manager
	 */
	public static ImageManager getInstance( )
	{
		return instance;
	}
	/**
	 * Gets the image by the given URI
	 * 
	 * @param uri
	 *            the url of the image file
	 * 
	 * @return Returns the image,or null if the url is invalid or the file
	 *         format is unsupported.
	 */
	public Image getImage( String uri, boolean refresh )
	{
		Image image;
		URL url = null;
		try