PATCH: playlist notification for scripts

[Miguel Angel Alvarez]

Hi all,
This patch will add a new notification for scripts to make them aware of 
changes in the playlist.
The notifications added are:
playlistChange: changed
playlistChange: cleared
playlistChange: reordered

The first one is emited if songs are added or removed from the playlist.
The others, as their name suggest.

The patch is against current svn.
Please, consider and apply, if possible, in 1.4.6. 
I need it badly to add an auto-scan feature to the replaygain script.

Regards,
Miguel Angel
-- 
Don't see the world through a window, be open{source}minded, and be free :-)
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