SystemUI: fix calculating alpha for back button in landscape mode.

Change-Id: Iea7a2eed86d4b65d3772b95f613d1853c66a0158
Wallpaper Overscroll and Transparent NavBar

Now possible to offset wallpaper windows by more than the size of the wallpaper
and add added a transparent mode to the NavigationBar

Change-Id: I4ef1f720f58785d98989a7e31c424498432cee1d
revert camera icon disable when Settings.System.LOCKSCREEN_MODLOCK_ENABLED was set to 1

Change-Id: Idaa3d7ba63d2c3a9e1d91b4892c1a074cbbc9cd6
hide search assistant arrow from lockscreen when custom lockscreen is enabled

Change-Id: I1a0f01561efc1223ba8b7e168cbfd2ab47a79708
frameworks: allow Keyguard package to be defined in overlay

This way, custom keyguards can have their own namespace.

Change-Id: Ia2dfa57652c6f3d3404963897fb2f20a265e5c76
Signed-off-by: Roman Birg <roman@cyngn.com>
SystemUI: add left and right virtual buttons while typing

Change-Id: Iea446443d33ff305765e47c86523b619676116ac

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