SystemUi : Port forward statusbar brightness control

Brings back the status bar brightness control from cm-10.2

Change-Id: Icc04e7da3286e9925f8b90528c1e022b33d33e9d
Add GlowPadView extensions needed for lockscreen targets and nav ring.

Change-Id: I4f82fd3fe04ac16c6737d38b2473f2a533c5d326
Bring back two-line layout for status bar date.

Change-Id: I4bf7ce61b22da89b3b8c1a3f00e077461061f7b9
Add back navigation ring customization.

Change-Id: Iebe4ec7c2519b85cfd5189d060444764a50f3cf6