This PR provides implementation of home screen notification for
`notSeen` messages received from a single number. The "single-number:
`notSeen` message notification distinct from "multiple-number"
notification with the following features:
- displaying formatted contact name
- `onActivated` it switches to respective thread window (instead of
all thread window) in `ApplicationMessages`
The PR also introduced some `ActiveNotificationsModel` code refactor
to align the implementation with `Single Responsibility Principle`
This PR adds home screen tethering notification. The notifications
allows user to disconnect tethering from desktop by focusing on
the notification and pressing `KEY_ENTER`
This PR adds also home screen notifications icons in `.png` format.
Icons shall be converted to `.vpi` and used in other tasks regarding
home screen notifications.
This PR provides following changes in notifications:
- notifications were extracted as widget for pop-up-based
locked-screen implementation
- notifications are ListView based implemented
- the most recent notification is displayed on the top of the list
