Add suport for custom nodes and tv shows in playlist info

Hi. I added in this pull request the support for custom video nodes (for example library://video/film/titles.xml) that works like playlists and I also added the parsing for tv show episodes.
If you want some change or implement it in a different way just ask it. If you want to rewrite it yourself no problem. It requires separate infolines for aeon nox skin (I will create a pull request for that too).