[PATCH] Enable playing of last.fm's tag stations

[Trever Fischer]

I noticed that for a while, Amarok didn't have the ability to play tag 
stations on last.fm. It only had artists, so I wrote this rather simple patch 
to add it. I'm not familiar with the coding style (particularly the header 
includes in my patch) and I'm also not sure if changing the play button to a 
qtoolbutton would upset anyone. I wanted to get some feedback before I commit 
or anything.

I've seen those 'cut-in-half' looking buttons (eg in GHNS) with two separate 
clickable areas (a main 'button' and a small arrow sub-button) but I couldn't 
find where they live in KDElibs.
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