Add "Clear all" button on recent apps list

Backported from CM10.0, Jellybean, (http://review.cyanogenmod.org/#/c/25984/), originaly from Paranoid Android

Change-Id: I29ddedda43e5243d1022fbda5b61808979d990e8
Add "DELETE_USAGE_URI" (needed to clear frequently contacted logs)

Change-Id: Ie1d5c4e96e76456924d409ce4f467033e2cf8ee5