sanitize(dirty, forceSanitize) {
    // If Sanitize is turned off
    if (this.options.sanitize === false && !forceSanitize) {
      return dirty;
    }
    return FormioUtils.sanitize(dirty, this.options);
  }
Sanitize an html string.
@param {string} dirty - The dirty html string to sanitize.
@param {boolean} forceSanitize - If the string should be force sanitized.
@returns {string} - The sanitized html string.