v0.5.1

Added

• The repo is now a workspace, and pure library code is separated out. This is mainly
  done to make it easier to develop implementations on different platforms.
• Link local discovery will now send discovery beacons on every interface the process
  listens on for remote beacons.
• Experimental private network support. See the private network docs
  for more info.
• You can now optionally expose Prometheus compatible metrics about the system by
  setting the --metrics-api-address flag.
• On Linux, you can now set an optional firewall mark by setting the --firewall-mark
  flag.
• Added a nix flake to the repo.

Changed

• We no longer create an outbound connection to a link local discovered IP if that
  IP is already known (usually as inbound address) with potentially a different
  port.