user_management.models.mixins.ActiveUserMixin provides a base custom user
mixin with a name, email, date_joined, is_staff, and is_active.
user_management.models.mixins.VerifyEmailMixin extends ActiveUserMixin to
provide functionality to verify the email. It includes an additional
email_verified field.
By default, users will be created with is_active = False. A verification email
will be sent including a link to verify the email and activate the account.
user_management.models.mixins.AvatarMixin adds an avatar field. The
serializers for this field require django-imagekit to be installed.