medialibrary: update to 0.13

This release brings a new set of features:

• Podcast and subscriptions first iteration. The implementation is still unstable but the data structures and API are ready
• Media caching
• New duration accessor in IFolder
• New private/public state for content exposing
• Playlist API refining
• Add new playlist filtering types: Video and Audio
• Implement favorites in all containers
• Implement an favoriteOnly QueryParameter to filter non-favorite items
• Implement better history accesses and cleanup methods
• Implement QueryParameter support for history access
• Notify media creation even for external media