YAML style double quoted string escape / unescape.
 /// <summary>
 /// Unescape control codes escaped with YAML double quoted string format.
 /// </summary>
 /// <param name="s"></param>
 /// <returns></returns>
 public static string YamlDoubleQuoteUnescape(this string s)
 {
     return(YamlDoubleQuoteEscaping.Unescape(s));
 }