Generate new Ed25519 identity key for XMPP username across servers

[chrisballinger]

Use hexified version of Ed25519 public key for your auto-generated username.

[ajvsol]

Is this still planned?

[chrisballinger]

We might be using this in combination with the SignalProtocol or Olm identityKey, instead of a new Ed25519 key. There are also still some UX issues to be worked out.