VanirActions: add reboot menu

reboot menu can now be set as a navring, navbar, or desktop shortcut.
i'd like to get a better icon for this at some point.

Change-Id: Ied7f9d7b662a1eec41e8311385ffdf50ea2b85c8
Powermenu: Delay screenshot by 1000 ms

Change-Id: I30382da6e12f913d7747f0f3eb9fc3eedcdcce39