RC: Powermenu styling update - based on trello

PS2: Adjust Preference behavior too

Change-Id: Ie65d747c20ccc5c3ae0db6a01e9318f1d2646d52
Signed-off-by: Gergely Szell (sethyx) <szell@hu.ibm.com>
Merge "RC: Powermenu styling update - based on trello" into jb-mr1