USB hdd support

[Maximilian Kossick]

Hi
The attached patch adds rudimentary support of external USB hdds (or to be 
exact, support for any device which is supported by DeviceManager and has a 
UUID. I only have USB devices here so that's what I have tested so far ) to 
amarok. It shows the songs on the USB hdd if it is mounted, and hides them 
when the device is unmounted. It also handles different mount points for a 
device.

At the moment, you can play songs by selecting them in the collectionbrowser. 
Smart playlists are broken, and i am still looking for the place to fix them. 
It doesn't convert a database yet. So if you want to test it, please create a 
new database.

This is my first time programming KDE/Qt as well as my first time programming 
C++ in quite a long time. Any comments on the code are therefore most 
welcome. Andrew mentioned that its best to discuss changes like this on IRC. 
My IRC nick is maxx_k .

-Max
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