Garry's Mod JukeBox - YouTube Music Player

This update allows Managers to bulk-add videos using YouTube Playlists. Currently, this supports entering a Playlist ID, which will then be used to auto-generate a list of songs to add to the JukeBox. These can then be edited once added to the JukeBox. This currently only supports the first 200 songs in a playlist to prevent freezing.

1. Added new admin tab, Add Playlist
2. This allows you to add up to 200 songs from a given YouTube Playlist.
3. Added setting JukeBox.Settings.DisableAddPlaylistTab (default false)
4. This setting allows you to disable the Add Playlist tab if you're worried Managers may abuse this feature.
5. Added setting JukeBox.Settings.PlaylistURL (default URL)
6. Added 6 new language phrases for the new tab, prefixed with PLAYLIST.

These new features haven't been tested with a full server. It should be fine, but you may want to consider only using the Add Playlist feature while the server isn't busy or mid-round.

There have been changes to the shared_settings.lua and shared_language.lua files, so the files will have to be replaced. Make sure to carry over your settings.