Deprecate bulk_mail::pretty_name, trivial wrapper to the parameter api, which won't do anything to ensure that the pretty_name we are retrieving actually comes from a bulk-mail instance
Deprecate bulk_mail::parameter, which implements a global parameter logic
For now, the occurrences have just been inlined (fixing also the inconsistent naming PrettyName vs pretty_name). A future reform might create a proper global parameter for this.