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: I2b0f1129a4cf73b8def35abb7072d0472a9cc972
add Custom Lockscreen switch

Change-Id: I3cc14cacf5462f589373b686f0dd87100507d524
Merge "Wallpaper Overscroll and Transparent NavBar" into cm-11.0
Merge "add Custom Lockscreen switch" into cm-11.0