End-to-end key setup

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1. 1
   Alice's phone makes a fresh key and combines it with Bob's keys into a shared secret
2. 2
   Alice's phone downloads Bob's key bundle, with one one-time prekey
3. 3
   Bob's phone builds the same secret, reads the message and deletes the used prekey
4. 4
   Bob's phone makes an identity key, a signed prekey and one-time prekeys
5. 5
   Alice sends the first message with her public keys and the ID of the prekey she used
6. 6
   Alice's phone checks the prekey signature with Bob's identity key
7. 7
   Bob's phone uploads the public keys and the prekey signature to the server