PIE 2.0

Pie is an alternative navigation and system info interface. It replaces the
standard navbar/statusbar with a navigation arc decorated with statusbar info.

Important notes for developers:
* When PIE is enabled apps don't even have to support immersive mode, they just have
  to check for configuration updates (sadly not even this is done by all apps).
  When PIE is disabled, apps have to setup an "onSystemUiVisibilityChangeListener"
  (best practice for PIE enabled, too).
* Changed how ActivityInfo handles apps capabilities like recalculate screen
  size etc. Check code comment(s).

Some info:
* Quicksettings and notification panels are not available anymore, google now
  replace swipe up gesture.
* Switched to kitkat colors.
* General improvement to the code, reorganize classes.
* Cleanup a lot and remove useless code.
* Merge with immersive mode, they live in a homogenized state.
* Improve immersive code a bit.
* Upon first activation, toggling immersive tile, the user is presented with a dialog asking
  to enable or disable the feature. The preference can be resetted in "Backup & restore" in settings.
* Reduce and center its trigger area.
* While pie is triggered screen is keept on.
* Depending on immersive mode, will show full or lite pie.
* New circled snap points.
* Detach pie on every rotation and/or when screen goes off while you have it triggered.
* What else, what some slices?

Key contributors:
@BigBrother1984
@D4rKn3sSyS
@Anu6is
@David96
@drcmda

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Signed-off-by: Jesus David <jesdga95@gmail.com>
Signed-off-by: Curtis Mayers <curtis.mayers@gmail.com>
Signed-off-by: David L.-W. <david.leppla.weber@gmail.com>
Signed-off-by: Paul Henschel <drcmda@gmail.com>
Change-Id: I6d09b1e2124d14e6cec48b40ea0c7948ebbb02b3