[WIP] 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 :)

Change-Id: I4a03a84539fd3ac1273f0d3503fe8fafcd16be26

Conflicts:
	core/java/android/inputmethodservice/InputMethodService.java
	packages/SystemUI/res/values/custom_strings.xml
[1/3]Base: All in One Animation Control (DO NOT MERGE)

Allow configure System, ListView, Scroll, and Keyboard Animation

base from
AOKP Animation Control https://github.com/AOKP/frameworks_base/commit/015c9cf00a8e49aea22d70b57b0af87c9134be73
thanks to Steve Spear <stephen.k.spear@gmail.com>

ListView Animation https://gerrit.omnirom.org/#/c/2863/
thanks to jkl5616<jkl5616@gmail.com>

Keyboard Animation https://github.com/zst123/XuiMod/commit/975cd531a9a847769b2af306495643a55ec44aaa
thanks to zst123 for patches

with slight modification to OmniRom

Scrolling Animation https://github.com/zst123/XuiMod/commit/48c180cfa762617f59b4ceb3da50a6c28befe24f
thanks to zst123 for patches

Conflicts:
	core/res/res/values/custom_strings.xml

Change-Id: I878e2e845c75a5e7ccf5de69383b18478de60d65

Conflicts:
	core/java/android/inputmethodservice/InputMethodService.java