Add support for GSM MMS APNs
It would be nice if NetworkManager have a way to store mms APNs. It'll help gnome-control-center manager MMS settings (as it now manages Internet APNS), which can be used by tools like mmsd.
the following settings shall be required for
- "apn-type" : A comma separated value of at least "default" and "mms" (and possibly other values), defaults to "default" if not set.
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