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
EmbeddedImage embeddedImage = handle.findImage( name );
		if ( embeddedImage == null )
		{
			removeCachedImage( key );
			return null;
		}
		Image image = getImageRegistry( ).get( key );
		if ( image != null )
		{
			return image;
		}
		image = new Image( null,
				new ByteArrayInputStream( embeddedImage.getData( handle.getModule( ) ) ) );
		if ( image != null )
		{
			getImageRegistry( ).put( key, image );
			if ( DesignerConstants.TRACING_IMAGE_MANAGER_IMAGE_ADD )
			{
				System.out.println( "Image Manager >> " + key + " added" ); 
			}
		}
		return image;
	}
	/**
	 * Remove cached image from map
	 * 
	 * @param key
	 *            The key of map.
	 */
	public void removeCachedImage( String key )