"Clear all" button on recent apps
Highlight the clear button in the recents view when clicked

This commit also makes copies of the ic_notify drawables for the recents
panel to avoid any collisions with possible future changes to the
notification bar UI. (The pressed state drawable was already an unused
leftover resource).
Recents : Fix clear all layout

Fixes the clear button from getting cut off due to the added
fitsSystemWindows in aosp