Refactor the line protocol package
Stop using net/textproto which is way more complex than what we need, instead just use bufio directly. Create a new 'lineproto' package with Servers and LineServers. While this initially duplicates most of the ai3/go-common/unix API, the duplication will allow us to deprecate the other interface once this one is complete.
Showing with 416 additions and 102 deletions