Revert "clear all recents button"

This reverts commit 72e841e576a127893cb7be77082193b6cf76bd01.
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
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

Conflicts:
	core/java/android/content/Intent.java
	core/res/res/values/custom_strings.xml
	services/java/com/android/server/wm/WindowManagerService.java
Recents: Launch as Floating App

Ported from JB 4.3
Based on hybrid (Aaron) and Halo (Jesus) implementation
Launch floating notifications from notification panel (long click)

 * Status bar - long click on notification select 'floating mode' option

fix derp in floating notification launch

Notification long press fix

Conflicts:
	packages/SystemUI/res/menu/notification_popup_menu.xml
	packages/SystemUI/res/values/pa_strings.xml
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/halo/Halo.java

Conflicts:
	packages/SystemUI/res/menu/notification_popup_menu.xml
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
Clear all recents button based on PA commits

Conflicts:
	packages/SystemUI/src/com/android/systemui/recent/RecentsHorizontalScrollView.java
	packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java

Conflicts:
	packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java
Little fix