Newer Laravel uses Symfony mailer instead of SwiftMailer, and that means
that some configs and functionality have changed
In this change, we update config/mail.php with the new config layout and
name/functionality changes
of note:
* New configuration layout supporting lots of new/different mailers
* MAIL_DRIVER has become MAIL_MAILER, though we'll support both
* MAIL_ENCRYPTION is mostly useless, and we mark it as such -- symfony
mailer detects which type of encryption to use automagically.
* MAIL_TLS_VERIFY_PEER is now available in case of self-signed
certificates on the mail server, of if you want to access it by a
different name, or by IP
Accordingly, we also update the .env examples, docker configs, and
the .env builder in the snipeit.sh installation script with the above
changes
