resolved: replace DNS_ANSWER_FOREACH_FULL() iterator macro with DNS_ANSWER_FOREACH_ITEM()

resolved: replace DNS_ANSWER_FOREACH_FULL() iterator macro with DNS_ANSWER_FOREACH_ITEM()

The more fields DnsAnswerItem gains the less sense it makes to pass
every field of it as separate parameter to an iterator macro. Let's
simplify things here, in preparation of adding more fields to the
structure later on: let's just return the structure itself in the loop,
rather than the individual fields.