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
{
			url = generateURL( uri );
			if ( url == null )
			{
				return null;
			}
			if ( !refresh && invalidUrlList.contains( url.toString( ) ) )
			{
				return null;
			}
			String key = url.toString( );
			image = getImageRegistry( ).get( key );
			if ( image == null )
			{
				image = loadImage( url );
			}
			if ( image == null )
			{
				if ( !invalidUrlList.contains( url.toString( ) ) )
				{
					invalidUrlList.add( url.toString( ) );
				}
			}
			else
			{
				invalidUrlList.remove( url.toString( ) );
			}
		}
		catch ( Exception e )
		{