"Clear all" button on recent apps

Port forward from cm-10.2

Change-Id: I9ebcf22f85957f61caefb14e0efd4cf2978d92cd
Screenshot : Pass current user

Needed to complete the snapshot procedure

Change-Id: I40f63e261e213136cd739c06da6f005173427ae0
Fix recentpanel position in landscape mode
Fix missing top task in recent panel.
https://github.com/CyanogenMod/android_frameworks_base/commit/0616667d980db1aa32d6dd1956d6fc2e232cf5a3
Better close all recents button
Fix no recent apps color