Allow to delete notifications

[nickvergessen]

In the browser you can delete notifications on hover:

In the android app that option should also be available (maybe by swiping the entry to a side)

To create a notification:

1. Install https://apps.nextcloud.com/apps/admin_notifications
2. occ notification:generate <username> <message>

[mario]

That's for 2.1. Currently notifications are not even stored anywhere.

[mario]

Can potentially be part of #1271.

[nickvergessen]

No need to store anything, just allow to send a simple DELETE request ;)

[tobiasKaminsky]

Please let us do it independent from any other PR/work.
As far as I understand we simply need a "x" (delete) button or a "swipe to right" gesture. On that action we send a delete request to the server.

[xXSTrikeXx]

I have tested the notification in the bus. The request delivery of the notification works in 2.0 RC2. Havent tested it all, but I think it doesn't notificate the Android system about notification, is it?

Just want to say, great work ;)

Sent from my HUAWEI MYA-L41 using FastHub

[AndyScherzinger]

Implementation is #3607