Fix domain name parser

[k0ekk0ek]

A mere . (dot), or <root> is not handled correctly yet for quoted domain names. A quick fix was put in place because the algorithm must be updated anyway. i.e. delimited_t was put in place to quickly cover parsing of RRTYPE as part of #64, but after #81 that's no longer required. The delimiter check can even be improved upon and a better algorithm may even be put in place as part of #66.

[k0ekk0ek]

Since the length member was re-introduced for tokens in #96, contiguous and non-quoted domain names are parsed using the same logic and the updated name parser explicitly checks for . (root label). This issue can be closed.