General

Update the Mono.Nat and ReusableTasks dependency to the latest release.
Small performance improvement handling incoming connections.
Moved the HttpTracker code to use HttpClient instead of a plain old HttpWebRequest. This was mostly due to HttpWebRequest.Abort being buggy under .NET Core which caused some HttpTracker tests to fail.
If a magnet link is used to download a torrent, and the magent link specifies trackers, those trackers are stored in the generated torrent metadata for future use.
When in metadata downloading mode, the engine will no longer throw an exception if a BitfieldMessage is received from other peers. The impact of this bug was that metadata used to only be downloaded from seeders or leechers with 0% of the data downloaded. Now metadata can be downloaded from peers with partial data.

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