Return: Smart Pulldown [2/2]

Adds the ability to directly open the QS panel when there are
no notifications present in the notification panel.
This commit combines the enhancement by HardCorePawn for detectin
notification types for the same.

Change-Id: I2021e33cebdef68ce366e486c013e2949c0128f7
Credits: kufikugel, HardCorePawn
[2/2] SystemUI: Add brightness slider to notification drawer

adds a brightness slider below the expanded statusbar header and
(if enabled) quick settings ribbons

Change-Id: I3dea51561ae26410c6625cbd04a301d785db4aa8