This feature (when enabled) will allow for invite_only sites to require
external authentication before they can redeem an invite.
- Created hidden site setting to toggle this
- Enables sending invites with local logins disabled
- OAuth button added to invite form
- Requires OAuth email address to match invite email address
- Prevents redeeming invite if OAuth authentication fails
https://stackoverflow.com/a/47822599/17174
Chrome 63 and up start ignoring `autofill="off"`
Per: https://bugs.chromium.org/p/chromium/issues/detail?id=468153#c164
> The tricky part here is that somewhere along the journey of the web autocomplete=off become a default for many form fields, without any real thought being given as to whether or not that was good for users. This doesn't mean there aren't very valid cases where you don't want the browser autofilling data (e.g. on CRM systems), but by and large, we see those as the minority cases. And as a result, we started ignoring autocomplete=off for Chrome Autofill data
So to work around this decision we now explicitly say: autocomplete="discourse"
when we don't want Chrome to randomly fill in addressed (aka. always)
