settings: Privacy Guard support

 * Add toggle to InstalledAppDetails to enable/disable privacy guard flag on
   a per-application basis.
 * Add toggle to enable privacy guard by default for applications.

Change-Id: If03aa5319c520b6c4a78887f0f46ef1443ddaa83
Merge remote-tracking branch 'cm/cm-10.1' into cm-10.1

Conflicts:
	res/xml/security_settings_app_cyanogenmod.xml