Slimtroll: Clear All Apps button added in Recent Panel (1/2)

Based in the work of benjamingoodwin && xplodwild && Stefano Murra
Slimtrolled.. because it's a bad habit ;)

needs https://gerrit.slimroms.net/751
Change-Id: Ia2692c4524f0f3d4e25bfb058a422067020e02d8

Conflicts:
	core/java/android/provider/Settings.java
	packages/SystemUI/res/layout-land/status_bar_recent_panel.xml
	packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java