[feature] notification badges

[jrpie]

requested by @straycosmicllama in #41

App icons in the list of apps should show a notification badge

An option to show notification badges without app icons would also be nice (see #42)

[jrpie]

I'm not sure whether this is a desirable feature. Notification badges encourage idly scrolling through the app list. However the point of that list is only to find apps quickly. In that use case notification badges don't really serve a purpose.

To get an overview of notifications Android already has the notification drawer, so I see no need to reimplement similar functionality in this app.