Implement account creation; add base class FormData to validate forms

src/Dependencies.php

@@ -145,14 +145,13 @@ class Dependencies
                 $c->get(SessionHelper::class),
                 $c->get(UserHelper::class),
                 $c->get(AccountHandler::class),
-                $c->get(AccountRepository::class),
-                $c->get(AliasRepository::class),
             );
         });
         $container->set(AccountHandler::class, function (ContainerInterface $c) {
             return new AccountHandler(
                 $c->get(AccountRepository::class),
                 $c->get(AliasRepository::class),
+                $c->get(DomainRepository::class),
                 $c->get(PasswordHelper::class),
             );
         });