Release triggered by issue vi#138

Non-vendored OpenSSL

Bugfixes, but flawed build

Default threaded stdio, `log:`

A heartbeat release

Unfinished migration, but many features accumulated

I'm not sure if I have enough attention span to actually
sit down and finish real Websocat 2.0.0

Basic auth, header forward

Ping'n'proto

tokio, conncap, pkcs12-passwd, typos

cargo fmt