base: added screenshot delete action in notifications

allows deleting a screenshot from the notification
inspired from CarbonRom - initial from CM I guess

Change-Id: Ib825cfd5aa7d3b9730895500a7d53c0151c895f4
[1/2] base: add CPU info overlay

this shows
CPU temp (if available)
for every core governor + online + freq

Change-Id: I8e2fd81edd8499eea2b1a6de8c042938387b33ef