Base: Floating window with multitasking(PS23)

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
PS.18 : fix layout calculation when rotate
PS.19 : support minimize/maximize window (see App circle sidebar)
PS.20 : fix previouse app
PS.21 : rebased due to changes in 4.4.3_r1.1

Change-Id: Iad00c239de7d66e8bb45205ce626d4f08417b7cd
Signed-off-by: Anthony <Disciple3603@gmail.com>

Conflicts:
	core/java/android/app/IActivityManager.java
	core/java/android/content/Intent.java
	core/res/res/values/custom_strings.xml
Add option to open notification in floating window

Depends On: https://gerrit.omnirom.org/#/c/6380/

Change-Id: If729dd729d301b70b764248ec1da87fc70f3e0b2
Signed-off-by: Anthony <Disciple3603@gmail.com>

Conflicts:
	packages/SystemUI/res/menu/notification_popup_menu.xml
	packages/SystemUI/res/values/custom_strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
Launch apps in floating window from recents
Let's try to get this right this time

Signed-off-by: Anthony <Disciple3603@gmail.com>

Conflicts:
	packages/SystemUI/res/values/cm_strings.xml