De-hybridize Torrent

A feature that may be desired for some anti-V2 trackers. While I would like to see the torrent community going the other way around, some trackers choose not to allow version 2 torrents and sometimes even hybrids.

The torrent file library now allows cleaning unnecessary or undesired metadata versions from a torrent file.

The intended use and the primary future scope is actually the other way around: the ability to remove version 1 metadata to make use of easy mutability of version 2 torrents to add or remove files in existing torrent structures.