This aims at bringing the notifcation display closer to what regular
messages look like, namely:
- show compressed chat keys
- don't show identicon rings for ENS names
- fix timestamps and their tooltips (`notification` isn't part of StatusMessage!)
- unbreak clicking outside of the whole popup overlay (`activityCenter`
is undefined)
- fix blurry checkmark icon for marking notification as read
due to the refactor, StatusMessage is no longer the toplevel item inside
the delegate, so adjust the functions
some minor cleanups and dead code removals; striving for keeping the
number of properties and bindings inside a ListView delegate at a minimum
MishkaRogachev
Lukáš Tinkl
Boris Melnik