Updated Traditional Chinese translation(Hong Kong and Taiwan)
basic layout for SongsList widget
rebased on top of current master
added playlists.py to makefile
added dialog for playlists selection.
added playlistdialog.ui
Some Add to Playlist Dialog cleanup

- Move some of the code into the ui file
- Fixed the renderer that doesn't show up
- Add missing window decorations
- Some code refactoring
Start editing New Playlist item on single click
Cleanup class ordering
view: Add songs list view to Playlists view
grilo: Check for grilo filesystem plugin
grilo: Add method to get a media object from uri
playlists: Add new method for getting path to a playlist
playlists: Add method for parsing playlists
grilo: Connect signals to registry first before loading plugins
playlists: Skip unexistent files
view: Load songs of playlist when selected
view: Monitor playlist songs
view: Update model when current track changes
grilo: Use synchronous get_media_from_uri

The async one causes segmentation faults.