PerformanceControl: rework time in stats fragment

-support overall stats (need kernels support https://gerrit.omnirom.org/9005)
-enable refresh/reset/restore support
-added active time stat filter

PS4
-added share action
-reset saved offsets on boot

Change-Id: I4255457c382a724ccb5774714ce52dcab924ccbf
Merge pull request #10 from omnirom/android-4.4

PerformanceControl: rework time in stats fragment