Multi-window

This is a big work in progress, which currently has some bugs,
but begins to look okay.

You can already multitask a little bit, by using the
app switcher and long-pressing an icon, then select "Add to
Split View".
Last window touched gets the key focus.

Code is very ugly, I know. Don't merge it, don't use it
for now. Unless you want to make your code ugly.

Enjoy :)

Merge conflicts solved:
	packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java

Change-Id: I4a03a84539fd3ac1273f0d3503fe8fafcd16be26

Conflicts:
	core/java/android/inputmethodservice/InputMethodService.java
services: don't clear wallpaper when SystemUI
disconnects.

When we restart SystemUI (or the user), sometimes
the wallpaper would get cleared. This patch just
captures its originating component and
if that is our SystemUI component, ignore the event.

Change-Id: I3e159dc2c013e7d7e552e3c0cef55e3ab970ca87
Signed-off-by: Roman Birg <romanbirg@gmail.com>
Fix battery icon with percentage showing "!" and percentage only color when under 14%

Change-Id: I559fd4d9fbb7f9599fe1b3cf75602b7ad7e2e301
Quiet hours [1/2]

and added multiuser support

Change-Id: I38e8560297099629aed94ee001da7f1ebaa04dac

Conflicts:
	core/java/android/provider/Settings.java