use threadpool instead of par_iter

The way the parallel iterator splits the items, we get results from
different bosses intermixed. The expected way to do it would be to
search all logs related to a single boss first, before moving on, which
is not what rayon did. Additionally, it forced us to collect the list of
files into a vector first, before we could start the actual search.

Using the scoped pool directly solves both of these problems, but the
error handling suffered a bit, as we now use unwrap instead of returning
a Result from the closure. But since we handle individual items, and
might not want to stop just because a single item was faulty, this
behaviour might be better.

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