Reimplement Que with Servant

Still todo: add authentication. But that can wait.

In re-implementing this, I was able to figure out how to get the Go.mult working
properly as well. The problem is that a tap from a mult channel does not remove
the message from the original channel. I'm not sure if that should be a core
feature or not; for now I'm just draining the channel when it's received in the
Que HTTP handler. (Also, this would be a good place to put persistence: have a
background job read from the original channel, and write the msg to disk via
acid-state; this would obviate the need for a flush to nowhere.)

Also, streaming is working now. The problem was that Scotty closes the
connection after it sees a newline in the body, or something, so streaming over
Scotty doesn't actually work. It's fine, Servant is better anyway.

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