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A better handling of notifications.

* jump from a single notification to a post (this is not working, when fedilab shows a conversation)
* only remove the Android notifications, I really looked at (don't delete everything if I was only in the notify timeline)
* show unviewed posts in the notify timeline with an unread marker (colored line left or right, or a separator between read / unread)
* maybe a manual "read all" or a timer for "I saw this post" (configurable?)
* group faves + and boosts together (the current grouping is helpful, but a lot of people boost and favs at the same time and this kills grouping)