Fix hidden "Remove" and "App info" buttons in landscape

On grouper the "Remove" and "App info" buttons are not visible if the device
is in landscape. Layout the children of the drag_target_bar vertically to
fix this.

Fixes: https://jira.cyanogenmod.org/browse/CYAN-3744

Before: http://i.imgur.com/SHMTUjK.png
After: http://i.imgur.com/4JeJi8k.png

Change-Id: Ie8a9a799fa89bf8ad233202da10c808ab65a66a9
Use wallpaper picker added to WallpaperCropper apk.

The code is still here for easier upstream merges.

Change-Id: I97ec1492e8acf7ff6a5ceef00a68f47e6444bf50
Trebuchet : Destroy cropview to avoid leaks in picker

If the cropview's TiledImageRenderer is rendering threads, the activity
context gets leaked. Avoid that by invoking its destroy in onDestroy() of activity.

Change-Id: I8503e88d1cab7fc8dab61ba7da148579902f0477
Merge "Fix hidden "Remove" and "App info" buttons in landscape" into cm-11.0
Merge "Use wallpaper picker added to WallpaperCropper apk." into cm-11.0
Merge remote-tracking branch 'upstream/cm-11.0' into HEAD