User role needs to be editable

[themeblvd]

Currently an admin user is created when installing the application. And only admin role users can manage users. But, there's no way for an admin user to create another admin user.

When creating a new user or editing a new user, there needs to be an option to select that user's role.

However, remember that while an editor role user cannot manage users, they can edit their own profile information. The client-side application uses the same form component for this as when an admin is managing users. So there needs to be a check here to not display that new role field.

Note that because this always planned to be an eventual feature, there's already a precaution on the server-side of things that doesn't allow a role field value to get passed when updating a user, if the user is an editor updating their own profile.