V7.4.1

This is a hotfix release for 7.4.0

Changelog

• Don't crash on OSError (errno 0)
• Fix issue with CreateTorrentEndpoint when a connection is lost
• Update IPv8 pointer
• Ensure recursive_unicode doesn't fail when encoding metainfo
• Fix TorrentDef.get_name_as_unicode
• Fix xrange error
• Fix KeyError in GUI
• Fix race condition in videoplayer controls
• Guard against subscribe/download of legacy channels