WIP: TOTP 2FA Authentication
This is the hubzilla/core portion of my TOTP 2FA implementation, to accommodate the corresponding addon (merge request separately submitted). The modification herein wires TOTP verification into the basic authentication sequence. As I'm not yet intimately familiar with hubzilla's innards, there's probably a better way to do this. This is at least a first stab at it and seems to work, at least superficially.
Edited by M. Dent