Hover settings (2/2)

- Require full screen
- Exclude non-clearable
- Exclude low priority

Thanks @Der-Schubi for this.
Adapted to crDroid sources

Change-Id: I05584f5d090f7aa044f8b67ba09192984ce83822
Hover notification timeout (2/2)

Allow user to set how much time the hover notification will stay visisible without touch the screen

Change-Id: I6a6fb5609a8dd4f97bfefdbbab38b87de8d2a11a