MediaScanner behavior on boot (1/3)

Lets you enable/disable/ask (with a notification) media scanning on boot.
Can speed up boot and reduce initial boot lag from MediaScanner

Change-Id: I634ae96b1dcb493b966b4653589cd97523b63da7
fb: update missing google UI changes for 4.4

thanks to kroz other things are now as well consistent to the new
google UI style

Change-Id: I604d29293b04bbcf279efd4d5bf2970ff8ee0c75
QuickSettings: Update all QS drawables to fit KitKat

- Recolored all drawables according to the new color theme
- Recreated some drawables to be able to include all in xxhdpi
- Remove some unused drawables

Change-Id: Ib5430059f67ff73677821122b8f2037094ba90c5

Patchset: 9
http://review.cyanogenmod.org/#/c/53724/