Provide more/better event hooks about librespot HOT 5 CLOSED

Related to issue #25

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Probably best implemented in #20

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It seems like the onstart/onstop/onchange hooks are more or less sufficient for your usecase, unless I am missing something?

What needs to be done is in player.rs switch them into arbitrary closures and move the "execute external program" part to main.rs. This way you'll be able to use your custom code by only patching/writing your own main.rs

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That's a starting point. But the player state handling is somewhat irritating: if a track plays out (ends) and a new one begins, I'd get a stop event. I was having a hard time trying to figure out from the callee whether the playback really ended or not. But that's probably my convoluted way of using librespot :-).

FWIW: as I'm not using librespot's playback but am piping the PCM stream through LMS, I did add volume change events, too. But that's really a non-standard use case.

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Continued discussion in #189 and being handled in #190. Closing in favour of those.

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