Playlist

In my opinion the playlist is good to go, I just solved the visual gliches, and I also merged with the songmenu branch, the popup-menu in screen_songs only appears if you have used the arrow-up menu to create a playlist, I understand Tronic' s argument that popups can be annoying, but in my opinion using the menu hides the playlist feature (you really have to search for it or know it, this will be solved once the webserver is in place) so it should be proper documented on the website. also the translation files need to be updated since I added a stack of menu options.

after a merge with master, I'd reccomend to start a new branch called "webserver" which will be used to implement the embedded webserver for remote playlist management. I personally think the web-interface should contain 3 tabs, 1 for viewing the playlist, 1 for managing it (adding and removing songs) and 1 to use as remote control for on-screen navigation.(arrow buttons, start and back).

so basically I'm not done yet, but this pull request is here to mark a milestone in development.