"Clear all" button on recent apps

Port forward from cm-10.2

Change-Id: I9ebcf22f85957f61caefb14e0efd4cf2978d92cd
Use cm dir for devutils & deviceutils

Conflicts:
	core/java/com/android/internal/util/cm/DevUtils.java
	core/java/com/android/internal/util/cm/DeviceUtils.java
	core/java/com/android/internal/util/mintkat/DevUtils.java
	core/java/com/android/internal/util/mintkat/DeviceUtils.java
	core/java/com/android/internal/util/purity/DevUtils.java
	core/java/com/android/internal/util/purity/DeviceUtils.java
Changes for immersive mode

Thanks to CM

Conflicts:
	core/java/android/print/IPrintDocumentAdapterObserver.aidl
	core/res/res/values/purity_strings.xml
	core/res/res/values/symbols.xml
	packages/SystemUI/res/values/mintkat_strings.xml