Enable token seed extraction #26
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This PR bases on the previous PRs #22 and #23 and allows the user to view the token seed and to copy it to the clipboard.
This can be useful in situations where the token had been created via barcode scanning (e.g. joyent does not show the seed). Loosing the seed in these situations essentially locks the user out of the 2FA service.
Extraction allows the seed to be copied to e.g. Keepass.
Downside: an attacker with temporary access to the phone could copy the seed when no PIN is set.