Quick settings: add statusbar setting page while editing

Adds a Settings page accessible while editing tiles at the very first
slot of the tile viewpager.

Long pressing the edit tile will put the qs panel into edit mode and
swing over to the Settings page.

Change-Id: Ie8416ac5446794a03e33ae260538ffcd9a253d57
Signed-off-by: Roman Birg <roman@cyngn.com>