tidy use of email and add trustedcallbackinterface for login block render function

Issue #[2644306] by [makeonlineshop, TR, stevecowie]: [Fix config delete problem that blocks module uninstallation]

first pass at replacing temporary untrusted role with a trusted role that works alongside authenticated user core logic

remove or comment out items from module file so that registration is handled by class as much as possible

move email field into class and comment out mail and redirect that do not work due to incorrect submit order

Correct form_alter for disabling email verification checkbox so that link to logintoboggan settings form works correctly.