threads.c: win32, changed the way thread handle is closed, which is now done on function exit, rather than thread_join

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Now we can legitimately not receive them, ahaha!

misc/events.c: We do want to send events to multiple listener. (oops, I should get some sleep). In this situation we can simply unlock for the time being making sure we won't reuse resources that can disappear.

control/media_discoverer.c: Implementation of a media_discoverer libvlc object based on top of services_discovery.

playlist/services_discovery.c: Improved services_discovery object, playlist independant. Now, the services_discovery plugin have to be converted to use this interface.

They should not be used by plugins. And in fact, they are not.