Tiny patch to differentiate between played and unplayed songs in playlist

[Paul B]

Hey I just created a small patch to display track titles in playlist 
in different colours based on whether they've been played yet or not, 
this is similar to a feature in Amarok 1.4 IIRC.

All the songs in playlist start off a blue colour (I used the link()-
>color() in palette()), and once they've been played they'll be 
displayed in the default black, it's useful when playing a playlist on 
shuffle, as you can see which songs have played and which are left to 
play.
Just a tiny patch, 6 lines, of which 2 are black and one is a comment 
:P.
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