Settings: Enable AppOps

Change-Id: If139b8511ac318e5e02e96f995008bd178c8f9ce

Conflicts:
	res/values/probam_strings.xml
	res/xml/settings_headers.xml
	src/com/android/settings/applications/AppOpsDetails.java
Display Settings: Better font size control

Use a SeekBar instead of a list/spinner to determine the font scaling.
For consistency, an approximate size (small, normal, etc.)
 and the exact percentage are displayed.
Show a preview of the selected font size immediately

Ported from CM 10.2, squashed commits 46678 and 49167.
Credit to Veeti Paaananen for the latter commit.

Change-Id: I754d7fdcaf27c23dfccf9d56291956e70b23f63e

Conflicts:
	res/values/attrs.xml
	res/values/cm_strings.xml
	src/com/android/settings/DisplaySettings.java