[Trusty] Introduce media-sound/banshee for UI integration and alternative for music DB on unity-lens-music. Fix missing icons for unity-lenses/unity-lens-music. Fix python_shebangs in unity-lenses/unity-lens-photos to only use one of those in PYTHON_COMPAT. Update icon cache for media-sound/rhythmbox
[Trusty] Update to x11-themes/ubuntu-wallpapers