Revert "Revert "HALO: make windows moveable and scaleable [WIP]""

This reverts commit 2ca62332f911debd3687e5c7303b1709d137c461.
Base: Floating window with multitasking

basic floating window are taken from AOSPA (HALO) by @D4rKn3sSyS

Drawables courtesy of @Alex Cruz thanks to him :)

with heavy change to get this work for multitasking

this feature, has ability to:
1. Moveable window to various position
2. Scaling window with 2 finger like zoom in/out
3. Double tap in actionbar or above window to fullscreen or back to floating window
4. Automatically resize when Snapping into one of side (Top, Bottom, Left, Right)
   (taken from xhalofloatingwindow by @zst123)
5. Automatically switch focus from other app (taken from multiwindow by @xplodwild)
6. Unlimited floating window app (depends on RAM)

this is still under testing, to make fully works
so if there any bug because of this, DO NOT REPORT INTO OMNIROM JIRA

to make app launch using Floating window feature

you must add Intent.FLAG_FLOATING_WINDOW
before start an activity

for example you can look at https://gerrit.omnirom.org/6515

need https://gerrit.omnirom.org/#/c/6561

PS.17 : fix scaling

Change-Id: Iad00c239de7d66e8bb45205ce626d4f08417b7cd
fix styles

Change-Id: Iba1474de4a3b2c7430ca8eb7f5c9b12a0454211a
Floating window: Enable transparent layer

Halo: Re-enable transparent layer

Change-Id: I3af24ed40314ca5edb1e5157c0ad9df8ac89c99f

App sidebar: enable transparent layer for floating apps

+ cleanup

Change-Id: I6ae8209f7d7839c78840e69bc9597d43fbedc790

enable transparent layer on notification long click

Change-Id: I058a19776bd90d964b5d5df4fcf251c784b3ba8c
Kill floating activities running in the same thread when tapping outside

This change makes all activities from the same app to be finished when we tap outside the halo window. Other apps running in different threads
(floating or not) won't be finished.

Port from here: https://github.com/ParanoidAndroid/android_frameworks_base/commit/f489f45ab2ba5dd4991c241917f7f4b0fd74b884

Change-Id: Ie6d6f46b2e23be60f991520ed480c2866fb2d0e3
Bring floating window in line with ParanoidAndroid

Change-Id: Id39b454ce58ff6071d2bb739cca4bb012039b2d5