0.15.0

[museun]

This removes the Connector trait and favors independent crates. This'll allow more flexible versioning (and changes/additions) for external deps.

This changes the Encodable trait to use a &mut dyn Write so the trait implementations can be object safe.

This removes the AsyncRunner and provides a bunch of composable functions instead.

The MpscWriter is now usable in both sync and async contexts.

Add Sink/Stream wrappers for Encoder/Decoder

Add a Handshake type that allows a connection flow to be started/wait for it to be ready.

Remove most of the stuff from the root, re-export common types into distinct submodules:

• sync
• asynchronous
• stream

Add an idle_detection_loop that does the 'complex' part of the old runner -- but is reusable and is opt-in

What needs to be done:

• documentation
  • lib.rs
  • each connector crate
• readmes
  • main crate
  • each connector crate
• bring back examples
• migration guide?