Wallpaper Overscroll

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

Cr-patchset: remove everything respecting to transparent navbar;
it depends on CM's custom keyguard

Change-Id: I2b0f1129a4cf73b8def35abb7072d0472a9cc972
wallpaper: add missing @hides

Add missing @hides to setWallpaperOverscroll and setWallpaperOverscrollOffsets

Change-Id: I1cfe876272d7c0a94bef122567da30318eac9400
persist the changed position values in updateWallpaperOffsetLocked, even with a null mWallpaperTarget

Change-Id: I175773f6e0b3f91c1d983857028a89b959e4e9f2
add a getter for the x and y offsets of the wallpaper window

Change-Id: I35294bcac664e85cc5d344b50b5c4335a60d3f37
Make clear all button & ram circle location 100% programmable

this should help to keep them from jumping around or appearing
for a brief second even when disabled.

Change-Id: I401c9ad142db7ef8bbcf35fa93afff8a3a9fd8e6

Conflicts:
	packages/SystemUI/res/layout-land/status_bar_recent_panel.xml
	packages/SystemUI/res/layout/status_bar_recent_panel.xml