use FIDO2 security key for 2FA

[kkulshre]

This is an attempted solution to #176 based on the examples released with Qt 6.7.0 (simplebrowser) for authentication using FIDO2 security key.

When the QWebEngine detects a QWebEngineWebAuthUXRequest it is handled by a UI Widget to ask the user for their PIN and collect the security token.

The minimum required Qt version is 6.7.0 for this to work.

Tested using a M365 account using a Yubikey 5C.

[BenediktMeierUIT]

Maybe that would be sensible?

self.ui.m_confirmPinLineEdit.setEchoMode(QLineEdit.Password)
To put this line of code there?

[kkulshre]

Thanks for that. I decided to add the echo mode to the UI file directly instead of setting it during setup.