input: Add workaround for broken hardware keyboard support

* Add workaround var for devices with broken kernels

Change-Id: Ib6ade70f399067469ba5aece48c6ec4608125d75

Conflicts:
	core/res/res/values/config.xml
	core/res/res/values/public.xml
	services/java/com/android/server/wm/WindowManagerService.java
Disable touch while using the stylus (Galaxy Note)

Android 4.0 cannot form multitouch events from multiple input
devices. So it is not possible to report one touchpoint from the
stylus position and, at the same time, another touchpoint from a
finger touch. Instead, when a new input device starts up the currently
active input is cancelled. This is highly undesirable while writing
with the pen.

The easiest solution is to ignore non-stylus touch events while the
stylus is within range (hovering) of the touchscreen. For example,
N-trig digitizers implement this in hardware. But wacom digitizers do
report pen data simultaneously with touch data. This patch disables
(non-stylus) touch input within 50ms of stylus data. On my Galaxy
Note this is necessary to make stylus input usable.

Change-Id: I9f458d85d8bf83d6cf03b467d46ce066fd55b7e0
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