Save location endpoint

[alex-phillips]

added function to set torrents save location

[EhsanKia]

Thanks for this! I started using this library to update my torrent locations, only to realize it didn't have that endpoint. Manually patched locally, but would love to see this merged!

[EhsanKia]

Hmm, it seems like spaces aren't handled properly, at least on windows. They're converted to +'s, Investigating at which step they are urlencoded/decoded.

EDIT: Yep, looking at the webclient, it urlencodes it before sending, so spaces become %20 instead of +.
For now I will encode on my end, but maybe you could update your code to call urllib.quote()? Though it's urllib.parse.quote() in py3.

EDIT2: Actually, encoding before doesn't work because requests reencodes it, ending up with double encoded params. The issue is that requests uses urllib.quote_plus, which uses + for spaces instead of %20, and qbittorrent doesn't handle that well.

There's unfortunately no way of telling requests to use quote instead of quote_plus when you pass a dict, so the only option is to pre-encode your data before sending it in. But even that is tricky. In py3, there's urllib.parse.urlencode(params, quote_via=urllib.parse.quote), but py2 doesn't have that.
the very hacky solution is to replace quote_plus with urllib.quote_plus = urllib.quote.

[v1k45]

Closing because this change is not compatible with 4.1x. Thanks for your contribution.