Two factor authentication support (#630)
* Initial commit for 2FA support
Signed-off-by: Andrew <write@imaginarycode.com>
* Add vendored files
* Add missing depends
* A few clean ups
* Added improvements, proper encryption
* Better encryption key
* Simplify "key" generation
* Make 2FA enrollment page more robust
* Fix typo
* Rename twofa/2FA to TwoFactor
* UNIQUE INDEX -> UNIQUE
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Andrew