[RFE] Allow comments in authorization mapping file

[kurtlieber]

Per this discussion, please consider adding the ability to add comments to the authorization mapping flle.

[thefoster]

I was looking for the same as i'm using several Solo-/Yubukeys and found by simply trying that adding " #commentXY" at the end of each line in ~/.config/Yubico/u2f_keys just works fine, even on older Kubuntu 22.04 (libpam-u2f 1.4.0-2~ppa1~jammy1).
So IMHO a dedicated "feature" is not neccesary, maybe they can update the documentation.
EDIT: was too fast on this and have to retract the hint.
It "worked" for about a n hour likely because of some caching and is not sustainable :-/