"Daily updates" option for mailing list mode

[alehandrof (Alex Armstrong)]

FYI – there’s now a plugin allowing daily digests functionality:

Restore Mailing List Mode Daily Summary

For a variety of reasons the option for mailing list mode users to receive a daily summary email was removed. It turns out there are a handful of communities that relied on this feature and as such it provoked a good discussion about the restoration of the feature. It was mentioned in that topic that I was working on this. Thanks to @lkramer and team for sponsoring this work! https://github.com/joebuhlig/discourse-mlm-daily-summary This plugin adds an option to the email preferences for…

(This is currently essentially the old feature wrapped up as a plugin.)