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.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ImageBuilder.java
previewButton.setEnabled( false );
				if ( SessionHandleAdapter.getInstance( )
						.getReportDesignHandle( )
						.getVisibleDataSets( )
						.isEmpty( ) )
				{
					bindingButton.setEnabled( false );
				}
				else
				{
					bindingButton.setEnabled( true );
				}
				break;
			case URI_TYPE :
				complete = !StringUtil.isBlank( uriEditor.getText( ) );
				previewButton.setEnabled( complete );
				break;
			case EMBEDDED_TYPE :
				complete = ( embeddedImageList.getSelectionCount( ) > 0 );
				
				break;
			case FILE_TYPE :
				complete = !StringUtil.isBlank( uriEditor.getText( ) );
				previewButton.setEnabled( complete );
				break;
		}
		getOkButton( ).setEnabled( complete );
	}
	private void openExpression( )
	{