[NEW] Sending email notifications after editing time expires. And user setting for offline digest/notification frequency.

[pkgodara]

Closes #6506, #6079, RocketChat/feature-requests#787

• Administrator Setting to able/disable 'Sending updated message Notifications after editing time expires'.

Above feature works only if "Allow Message Editing" is set true & "Block Message Editing After (n) Minutes" is set to Non-zero value.

• Digest frequency for users in preferences.

This feature will work regardless of anything but have something else [See Comment].

[pkgodara]

Information regarding second feature:

Digest frequency would work independently but duplicate email notifications would be there.

So, to avoid duplicate notifications, these administrator settings are compulsory:

1. "Allow Message Editing" is set true.
2. "Block Message Editing After (n) Minutes" is set to Non-zero value (let say x minutes).
   3. "Sending Email Notifications after editing time expires" is set true.

If these settings are there, users will have x minutes to read messages & email notifications will not be sent for those messages.

[podzz]

I think this feature would be awesome. That would make sense to let the users get those notifications via email. Are you planning to rebase this PR with the latest code soon ?