* Update twofactor_email.hbs subject line to avoid triggering gmail content filter
Previous subject line was triggering Google's spam blocker, breaking the 2FA setup process if a gmail SMTP server is configured. The new subject line does not (currently) run afoul of Google's filter.
* Update twofactor_email.html.hbs subject line to avoid triggering gmail content filter
Previous subject line was triggering Google's spam blocker, breaking the 2FA setup process if a gmail SMTP server is configured. The new subject line does not (currently) run afoul of Google's filter.
* Update twofactor_email.hbs
Changed "Confirmation" to "Verification" for the sake of internal consistency
* Update twofactor_email.hbs
* Update twofactor_email.html.hbs
- Updated branding for admin and emails
- Updated crates and some deprications
- Removed newline-converter because this is built-in into lettre
- Updated email templates to use a shared header and footer template
- Also trigger SMTP SSL When TLS is selected without SSL
Resolves#1641
