Settings: Media Scanner on boot behaviour (2/3)

Settings part - fb part is merged and mediaprovider repo was patched up to LP

Change-Id: Ib9cf62b0e3550e6557248cd3d910908882a91c7f
Settings: add quick pulldown listpreference

as well respect rtl layout changes

Change-Id: I298794651302a34817d8212f7af9ad565d504c3c