Add Reboot system / Reboot recovery into Power Widgets (2/2)
This commit complements:
"Add reboot tile to QS (2/2) WIP
- Still need to colapse expanded status bar and show reboot message

Ported, with some adaptations, form Slim Roms

Change-Id: I05b716e06ad58f26cd54f51894f4b0489ff8efa4
Author: Kufikugel"