Hard linking as option for seeding handling

[Casvt]

Is your feature request related to a problem? Please describe.

Currently, the options for seeding handling are waiting for the torrent to complete seeding or copying the files.

Describe the solution you'd like

An extra option where instead of copying the files, a hardlink is made.

Additional context

How are we going to handle conversions and renaming? Do we put the hardlink in the volume folder (and move the file when seeding is completed), or move the file and put the hardlink in the download folder? The original file can not be altered while it's seeding, so we cannot convert it...