@accepts(utf8, Gtk.Window, Gtk.FileChooserAction, gboolean) @returns(Gtk.Widget) def file_chooser_new(title, parent, action, local_only)
Creates and shows a regular gtk+ file chooser dialog with a given title. The user's music directory (typically ~/Music) is added as a shortcut.
For consistency, this should be used anywhere a file chooser is required.
After creating the dialog, the caller should connect a handler to its 'response' signal to process the user's selected files or folders.