[2/2] Frameworks: HALO WIP

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
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.
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: I3e79945433d61da090ca263f4e2989be9987f11d