Implement CopyTorrentFiles, with tests
Implement DeleteEmptyDirs::execute() and ::undo(), no tests
Implement DeleteTorrent (tests) and DestroyTorrent (no tests).
Implement DeleteAllTorrents and DestroyAllTorrents, with tests
Implement StartTorrent and StartAllTorrents. No tests.
Implement StopTorrent and StopAllTorrents. No tests.
Implement QueueTorrent and QueueAllTorrents. No tests.
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