* typesafe stream handling
Now it's impossible for your to respond to a broadcast stream. Previously this would just fail due to the TCP connection having been closed by the sender.
* remove connected_peers state from `SpaceTime`
* use `OutEvent` instead of `tokio::spawn` for `SpaceTime` events
* Polling for events > tokio::mpsc
* extend max length of sync messages to ~4GB + broadcast done message
* Fix "actOS" operating system decode error