Zeroconf

- Improved performance of sending outgoing packets (\990) bdraco

- Reduced memory usage for incoming and outgoing packets (\987)
bdraco

- Improved performance of constructing outgoing packets (\978)
(\979) bdraco
- Deferred parsing of incoming packets when it can be avoided (\983)
bdraco

- Improved performance of parsing incoming packets (\975) bdraco

- Include NSEC records for non-existent types when responding with
addresses (\972) (\971) bdraco Implements RFC6762 sec 6.2
(<http://datatracker.ietf.org/doc/html/rfc6762#section-6.2>)

- Skip goodbye packets for addresses when there is another service
registered with the same name (\968) bdraco

If a ServiceInfo that used the same server name as another
ServiceInfo was unregistered, goodbye packets would be sent for the
addresses and would cause the other service to be seen as offline.

- Fixed equality and hash for dns records with the unique bit (\969)
bdraco

These records should have the same hash and equality since the
unique bit (cache flush bit) is not considered when adding or
removing the records from the cache.