Got the multiple-channel dispatching roughed in.  Also roughed in the event-sending interface.  Sped up the handling considerably for long pending queues (was doing a linear scan of the whole queue for each ack'd message, oops).  Also roughed in code for ordered-but-not-guaranteed channels (i.e. channels that keep the latest received values, dropping any missing messages).  Statistics are a bit more useful, and we now report and disconnect on congestion.  (Thinking maybe the disconnect shouldn't be automatic, should let the game decide what to do with it).