Clear Recent Apps (From NavBar)

Original author: TheMrcool212

this is not using cm's clear recents way, cm uses a button to clear recents but mrcool coded like pa's way at kk based pa roms so navbar recents button turns to clear all button when you open recents menu.

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarView.java
Don't remove the last app
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