General

Reduced the layer of 'async' methods for IPV4 and IPV6 connections
Minor improvements to endgame mode. The window within which a torrent has entered endgame mode has been enlarged, and performance has been improved in the case where a piece which completes in endgame mode fails it's hash check. It will be re-requested much faster now.
Webseeding has been fully re-enabled and new parameters have been added to EngineSettings to control its behaviour.
Fixed auto piece size calculations in TorrentCreator
TorrentCreator has has some minor performance improvements.

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