we move all business logic from model to serializer.
all API calls (direct and from front) will keep on triggering
expected 3rd party calls while admin actions will uniquely trigger
modifications in our database.
We remove 'secret' field, as it won't be of use in interactions
between la Régie and dimail. Régie credentials will be stored and used
as project variable.
We previously accepted '+' as a special caracter during mailbox creation.
We now remove it, as this caracter has a very special meaning and it wouldn't
make sense to create a mail using it.
We want people to create new mailboxes in La Régie.
This commit adds integration with intermediary dimail-api,
which will in turn send our email creation request to Open-Xchange.
Rename member role to viewer role for MailDomainAccess.
A viewer is only allowed to see list of mailboxes
created for a domain. It makes more sense to name it viewer.
