Log Message:
update lxmusic to 0.4.6.  changes:
- Corrected spelling mistake; Preference => Preferences
- Move libnotify conditional code to lxmusic-notify.c
- Bugfix for volume control
- on_tray_icon_middle_clicked: toggle play pause
- on_volume_btn_scrolled: increase/decrease volume on tray icon
- added missing funcion declarations
- Use XMMS2 "picture_front" album art for desktop notifications
- Make notification code implementation opaque
- clean rewrite of desktop notification code
- Code cleanup: Use macro to retrieve string/int track properties (removes code \ 
duplication)
- retrieve album art property: picture_front
- fixed non UTF-8 char
- removed un-used variables, fixed no-return-in-non-void function
- Few updates for build using more recent auto-tools.
- Added compatibility with libnotify >= 0.7.0.
- Fixed crash if "id" is not available.
- Fixed crash in using xmmsv_get_* functions.
- Fixed crash on NULL passed to guess_title_from_url().
- Fixed crash after deleting item from playlist.
- Eliminated duplicate gtk_widget_destroy() on main window which leaded
  to crash on exit.
- Fixed return value from lxmusic_do_notify_prepare() if no libnotify is
  available.
- It have to destroy any dialog windows on exit.
- Fixed few invalid casts and deprecated gdk_pixbuf_unref() calls.
- Allow compile with GLib >= 2.30 replacing deprecated functions.
- Added manual page lxmusic.1 to install tarball.