scrobbler: add functions to create and run it

Add a new function to create a scrobbler. The function takes care of
creating the mpd client.

Add a function to run the scrobbler, which takes care of creating a new
record when needed.

This will simplify the interface for the caller, as all they really care
about is: create the scrobbler, close it when we're done, and collect
songs information while we listen to our music.

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