static void deleteDirectory(Path directoryToBeDeleted) {
        try {
            if (Files.isDirectory(directoryToBeDeleted)) {
                Files.walk(directoryToBeDeleted)
                        .sorted(Comparator.reverseOrder())
                        .map(Path::toFile)
                        .forEach(File::delete);
            }
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }
@return The CSS class name for the icon.
stroom-core-shared/src/test/java/stroom/svg/shared/GenerateSvgImages.java