Recents panel: Clear all in navigation bar / pie

Fixed icon coloring in pie
Set clear all icon alpha to better match AOSP icons
Recents panel: clear all in navigation bar / pie

Hopefully fixed the sticky clear all icon, strange AOSP bugs with
recents panel still remain but at least the recents button will stay
functional at all times
Optimizations in additional Views created on recents panel - don't do it
if not needed