[WO-491] Allow STARTTLS, add Outlook.com

* Change UI to choose encryption type TLS/STARTTLS/None
* Change adapt login controller to STARTTLS changes
* Add Outlook.com to providers
[WO-491] Add GMX.net support
[WO-491] Add Web.de support
Merge pull request #114 from whiteout-io/dev/WO-491

Add STARTTLS, add Outlook.com, Web.de, Gmx.net to list