Add Statusbar Quick Peek [1/2]

Adds the ability to peek at the statusbar when hidden
by swiping down from the top edge of the screen.

PS 1/3 : Fixed Derp!
PS 4   : Added Fullscreen app support!
PS 5   : Added Pie Detection
PS 6   : Derp forgot the TOP Flag!
PS 7/9 : Some fixes

Change-Id: I4beda91e21518cd2fa391ff1b0fe23ea8e24370e

Conflicts:
	core/java/android/app/Activity.java
	core/java/android/provider/Settings.java