Do not allow disposable e-mail addresses for registration
Description
There are providers for disposable e-mail addresses like http://www.wegwerfemailadresse.com (https://cuvox.de). We should try to block them.
Goal
Make it more difficult to set up fake profiles
Evidence
https://foodsharing.freshdesk.com/a/tickets/1290
Solution
UserRestController::testRegisterEmailAction
and registerUserAction
might be good starting points. We could add a filter there. Maybe also in the settings module when changing the email address.