Drastically reduce connection state logging, queue offline messages

- We now only log WA connection state information at the DEBUG level,
  to try and avoid spamming the logs every time the websocket drops
  for whatever reason (which has become more frequent as of late)
- A new mechanism enables messages sent while offline to be queued
  and sent once the connection is reestablished, making small drops
  less of a pain.
  - This in fact re-uses the ack tracker code, so the user also gets
    alerted if the message doesn't send for a while.