General

Made PiecePicker.BasePicker public to make it easier for developers to interact with the chain of PiecePickers.
Fixed several issues with rate limiting. The per-torrent and overall upload/download limits should be fully functional now.
Made EngineSettings.PrefersEncryption default to true, as the documentation described.
DhtEngine no longer throws a NullReferenceException if null is passed in for the initial nodes.
Hashing can now be paused/resumed by calling PauseAsync and StartAsync respectively.

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