A high-level high-speed IO library for streaming large quantities of data between 2 prims in a region using lljson over ll.RegionSayTo, and doing Remote Procedure Calls. It implements flow control, and 3 types of messages:
  1. Iterable streams, similar to WebSocket (it's name inspiration)
  2. Remote procedure calls (RPC; this waits for a response)
  3. Notify (like RPC but don't wait for the response)