[2/2] Frameworks: HALO

Forward port from jb.
PS1: Initial port Fix conficts with notification LED Fix derp Major derp HALO Mods Rebase Fix blackist, code clean and added some TODOs
PS2: Fix build
PS3: Fix bubble sometimes doesn't respond on new notification
PS4: Align halo icon
PS5: Keep floating app in recents and disable transparent layer temporarily (NOT INCLUDED)
PS6: Fix conflict after recent merges
PS7: Cosmetic fixes: Fix buttons layout in status bar. Status bar button holders show halo + qs switch on notification and qs edit mode + notification switch on qs. Update new margins size. (NOT INCLUDED)
PS8: Rebase Clean white spaces Toggle on/off from notification shade icon (remove red X) Standardize behavior (remove option to reverse tap/double tap)
PS9: Remove references to LayerActivity

Change-Id: I4c5e973752536e92c38e74eae59e4ae0e7ceaa8a