Support system proxy auto-detection
In tpo/applications/tor-browser#40241 we received a request for auto-detecting the configured system proxy. Maybe something like UseSystemProxy [0|1] (with similar functionality to Socks5Proxy, except auto-detecting the values).
In tpo/applications/tor-browser#40241 (comment 2716349) Nick suggested that tor could link against a library if an appropriate open source library exists.
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