[messaging] Passphrase-based key mobility (was: Peerio)

[Mike Hearn]

The Bitcoin community also maintains word lists for this purpose:

https://github.com/bitcoin/bips/blob/master/bip-0039/bip-0039-wordlists.md

There are currently lists for English, Japanese, Spanish and Chinese.

There are 2048 words in the English word list and we use 12 words for our
private keys.
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