Prepare for PA halo drawables

This reverts commit 1137c5b217db0b6cabee5e0a66c7fabe77cda6ff.
HALO: new drawables for hdpi and mdpi

- scaled down the xhdpi drawables properly for hdpi and mdpi
- removed some old and unused halo pngs
Lock screen: Hide initial pages hints feature (1/2)
-Port and adapt of hide hints for initial page AOKP's idea (Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>).
 Option stored in lock screen settings.
-Moved last brightness strings in brightness section and fixed some code alignment.
Fix incorrect fragment animation used for hiding fragments
Mirror of support lib patch
https://android-review.googlesource.com/#/c/60032/ into
frameworks/base.

AOSP Commit: https://android-review.googlesource.com/#/c/60167/