[Suggestion] Warn about previously removed torrents being re-added

[mkahvi]

There's functionality for already existing active torrents, but I'd like there to be some sort of hash history for previously downloaded And removed torrents. For example, if I download something and deleted it or just remove it from the client, if I tried downloading it again, qB would warn me that it was removed (and possibly fully downloaded) previously.

I'm not one of those people who keep all previously downloaded torrents listed in the client itself, because that produces clutter I don't want to deal with. So the client keeping history of removed torrents would help reduce pointless downloading.

It doesn't need to store anything more than the torrent hash and maybe dates of completion and removal, and mayyybe location where it was saved at. And this would be only a warning, not blocking of the action.

Could be optional, have maximum duration such deletion is kept in history (e.g. 6 months) to limit the growth of the log, and such.