Extracting status bar from quick settings in split shade

First phase of moving status bar from quick settings to upper layer so status bar takes full width of the screen.
This change:
- hides status bar in quick settings and adjusts all paddings/margins
- reuses QS status bar as a full width status bar <- this will be fixed in following CLs
- creates controller for new status bar, which manages its (dis)appearing <- alpha/shift revealing animation TODO

Bug: 182981830
Test: manual (automated coming in next CLs if this approach looks good)
Change-Id: I84adf101d050ccbd286bc02808a9ad93aeda2039