[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
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
PS14: Rebase
PS15: update halo strings to prevent conflict with latest changes
PS16: Wrap all things!
      Modify halo behavior
PS17: Get the correct activity stack: this makes all windows in the same stack to get the floating mode
PS18: Stop pop-out on rotation
      Catch "silent" notifications
PS19: Rebase
PS20: Rebase, fix conflicts with recent merges
PS21: Fix missing commit messages from previous undefined patchset (19) and other conflicts

Change-Id: I3e79945433d61da090ca263f4e2989be9987f11d