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Remove Listen::Internals::ThreadPool

`Listen::Internals::ThreadPool` manages all listener threads.  Thus the
only way to kill and subsequently garbage collect listener threads is by
calling the `Listen::Internals::ThreadPool.stop` method (typically done
via `Listen.stop`).  This is a problem when individual listeners must be
stopped and abandoned for garbage collection.

This commit removes `Listen::Internals::ThreadPool` in favor of listener
instances managing their own threads.

Partially addresses #476.

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