Yubikey support

[asbiin]

Close #825

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[djaiss]

@asbiin awesome!

[asbiin]

@evaryont

Firefox 60 and later: Nothing, it just works out of the box.

Except it does not, on my computer ...

[nogweii]

@asbiin Oh, after looking at the Javascript I believe that's because you are using the U2F JS API. Firefox implemented the WebAuthN specification instead of it, which is more general. I believe Chrome supports WebAuthN as well, though Google's login services still rely on the older U2F API.

[asbiin]

@evaryont thanks ! I was not aware of this new API. I will try using it.

[asbiin]

@evaryont I will merge this right now, and we will implement WebAuthn later, see #1536. Thanks for the help!

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