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
Set some defaults [2/2]

Change-Id: I0fc56556d56be12524389c230a08861d300bc10e
merge changes from Omni 4.4 into local branch

Conflicts:
	res/values/custom_strings.xml

Change-Id: I2690b510a3db45798b78165d350e70490d8d23d0
[3/3] settings: battery light settings

Change-Id: Id97704714c81e47daf9ab56f935dbf23690d9538