Introduce PHPMailer library and Fix SMTP Mail send

Created by: andygrunwald

Context

This Pull Request is the new version of https://github.com/lansuite/lansuite/pull/524.

While I wanted to make https://github.com/lansuite/lansuite/pull/524 mergable, I pushed to many changes to the PR. Hence, I created this new, clean one.

The kudos goes to @mrflobow.

Description from #524

This commit fixes https://github.com/lansuite/lansuite/issues/490. For accomplishing the goal I added the libary phpmailer (as also suggested). No big issues with adding it to composer. I believe with using the library lansuite mail module gets future proof and can be used in wider server configuration.

Tested following combinations:

No Auth against local docker smtp container ->Success With Auth against MailTrap - >Success With TLS against Outlook. - >Success For public SMTP you can't send as different user so I added an optional configuration to set the sender instead of the user itself. Example could be used with noreply@something.com . If the configuration is left blank it will use the user E-Mail instead.

Summary:

Refactored Mail Module Used widely use PHPMailer for sending mails instead of reimplenting from scratch. Added new settings to make SMTP configurable as needed. PHP Composer lock has been updated.

Tickets

Fixes https://github.com/lansuite/lansuite/issues/490 Related https://github.com/lansuite/lansuite/pull/524