Added a host-mode

- Fullscreen video + playlist
- Removed fullscreenbutton in host-mode
- Removed skip-button in host-mode
- Disabled skipping in host-mode
- Removed buttons and rightclick menus in host-mode
- Host mode for easily having a computer playing at a party without being able to modifying the currently playing video/song

server/routing/client/api.js

@@ -1136,7 +1136,6 @@ router.route('/api/list/:channel_name').post(function(req, res) {
                                 } ]
                             }
                         };
-                        var channel_name = req.params.channel_name;
                         db.collection(channel_name).aggregate([
                             {
                                 "$match": { }