[Base]: recents panel clear all button tweaks
- Show or hide recents button
- Place the button in top right or left

Change-Id: I37b714c4f1211608567abb84c3ba92351cec3d10
by: @cristianomatos

Conflicts:
	core/java/android/provider/Settings.java
[base] long press back to kill configurable timeout (1/2)

Forward ported from crDroid kk
Fix compilação [2/2]