Remove the default wallpapers

 * Wall of wallpaper choosers :(
 * Wallpapers go in CMWallpapers

Change-Id: I713b8a10ed55427d0fc3fbce6cdf980e0d22b9a5
Trebuchet: Allow uninstall/app info shortcut with locked homescreen

Allow users to access the drag-and-drop uninstall and app info shortcuts
even when the homescreen is locked.

Change-Id: I67721e0d653b59ae7c8af8bac5ede754cb0615f8