fb: add back all keyboard IME features back (1/2)

this commit adds:

- ime switcher notification - thanks cm
- slims fullscreen disable on landscape
- slims force autorotation on IME
- volume button control for navigate in the message - thanks cm
- slims force to show always enter key

some fixes to the 4.2/4.3 implementations + added full multiuser
support for all this features

cheers

Change-Id: I71e93c39620cc171e658b2d7e26491bac97c651d
Status bar brightness control

+ added some fixes to original implementation (thanks mostly cm for that)
+ add multiuser support

Change-Id: Ibc5cc15a9b43eade73670d308d5cc788c93b6210
fb: add DeviceUtils helper class

for common calls we need later on several places

initial push with only display type support

Change-Id: Ic8856512d8a7540eda3e4ba8d28f3eec3e6961d0