Privacy Guard Slim version (1/2)

Re-implements slims ehanced privacy guard from 4.3
and addapt it to 4.4 changes

Change-Id: If57de2b541fa6b0a590fd65e8664bf173e259035

Conflicts:
	core/java/android/provider/Settings.java
	packages/Keyguard/res/values-sw540dp-port/dimens.xml
Frameworks: fix notification cancel on privacy guard

new activity stack from google to handle the shiny new launcher
stuff is running on several instances. That said mPrivacyGuardPackageName
currently does not survive when going from an app into launcher. Make
it static to solve it.

Change-Id: Ic9374d2cc58cb716b086365ab8aa96ffaef44879