Replaces the OC_Mail and phpmailer with SwiftMail allowing us to mock it properly.
Fixes the unit test execution on master on local machines and https://github.com/owncloud/core/issues/12014
Conflicts:
3rdparty
lib/private/server.php
lib/public/iservercontainer.php
tests/lib/mail.php
tests/settings/controller/mailsettingscontrollertest.php
Conflicts:
3rdparty
lib/private/mail.php
lib/private/server.php
lib/public/iservercontainer.php
settings/ajax/lostpassword.php
settings/application.php
We oC 8 we use the `StringUtils::equals` method which will also verify the type, since we don't anylonger hash the token twice this is required in case somebody is able to invoke this route with an empty `$token`.
This patch wil warn the user of the consequences when resetting the password and requires checking a checkbox (as we had in the past) to reset a password.
Furthermore I updated the code to use our new classes and added some unit tests for it 👯
Fixes https://github.com/owncloud/core/issues/11438
