Floating Window: Welcome back

* Port squashed jellybean floating window to kitkat.

Floating window contributors:
@drcmda
@beerbong
@D4rKn3sSyS

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>

Merge notification manager service changes.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>

Change-Id: If3d6338f657915754bd6cb9cb987df62c17aa6d0
1/2 Base: implement app circle sidebar
2/2 Base: App circle sidebar (add support floating window)
Frameworks/Base: App Circle sidebar (add support Samsung multiwindow flags)
App Circle Sidebar: Support for Configurable Trigger Region[1/2]
App Circle Bar Toggle [1/2] (WIP]
Omni: Floating window with multitasking