Add a possibility to delete all Notifications

[kichetof]

Hello,

Actually, you can mark all notification as read, but you can't delete all in one action.
Each deletion need a validation to the alert, that could take long time to delete all.

Hopefully you'll add something to delete all :)

[Tarpsvo]

@davidhemphill A quick-win feature. A highly appreciated one from those users who heavily rely on notifications. 🙏

[davidhemphill]

I just added this and pushed it in 4.27.8 👍

[Tarpsvo]

This is amazing news, thanks a ton! 🥇

[kichetof]

Many thanks for this feature!! Really appreciate! 👏