PIE: animation revamped (back to the first draft), style changes

Change-Id: I9e521ed4f7be2df629f58d933bad286486ec4a71
Policy: fix keyguard statusbar showing while in ext desktop, fixes it in
apps like currents as well

Change-Id: Id3e4b99d60c33e4050e0e97c365d1ae739f603ec