Make QS columns count configurable [1/2]

And add infrastructure to add more settings and
distribute them to QS panel

PS4
we must explicitly hide the columns submenu

*DU Edits*

- Remove QSCustomizer menu item/qs changer
- Make edits to use seekbar in settings

Screenshots
https://i.imgur.com/tyH2EZfg.png
https://i.imgur.com/MrUc0aTg.png
https://i.imgur.com/oQIrWizg.png
https://i.imgur.com/jsVZ7kTg.png
https://i.imgur.com/hVIZQiGg.png
https://i.imgur.com/Rfa5DSxg.png

Change-Id: I4f841adfa48cdde4a21db58785a72cdaf3d38173
10 files changed