openbox/lib/moc: Eliminate only unneeded error messages
openbox/lib/moc: Parse song info line in playlist
openbox/lib/moc: Fix documentation
openbox/lib/obmenu: Add function to create menus
openbox/lib/obmenu: Move id naming logic out of create_pipe_menu()
openbox/scripts/alsa-pipe: Rename option '--card' to '--mixer'