Settings: Enable AppOps

Enables back the AppOps activity and add a warning dialog on system
core app. Adds a "Apps permission" section under Personal.

Change-Id: I1d53d9430bd00003040b997e6ba939923847035f
Merge remote-tracking branch 'upstream/android-4.4' into android-4.4

Conflicts:
	res/values/custom_strings.xml
settings: add back all keyboard IME features back (2/2)

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: I58596f11ee09c6db77119f3e3044e1ec2dd30c0a

Conflicts:
	res/values/slim_arrays.xml
	res/values/slim_strings.xml