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938a873e19
HTTPS already reaches the origin through a CONNECT tunnel (#85), but plain HTTP still used the absolute-URI request form, which a CONNECT-only proxy like Tor's HTTPTunnelPort rejects. Adds a `connect://` proxy scheme (`-P connect://host:port`) that drives the proxy with CONNECT for every request: httrack opens a tunnel to the origin (port 80 for http, 443 for https), then sends the request origin-form with no Proxy-Authorization, the same way https does. It can't be the default (CONNECT-to-:80 breaks proxies that only allow CONNECT on 443) and auto-detection is ruled out, so the mode rides the proxy scheme like socks5:// does. That keeps it ABI- and cache-safe (the scheme lives in proxy.name, no new struct field) and drops into the webhttrack GUI as one more entry beside HTTP and SOCKS5. The tooltip was reworded and retranslated across the lang/*.txt files. Test 57 fronts a plain-http origin with a CONNECT-only proxy (it 501s anything but CONNECT) and checks the request arrives origin-form, that dropping connect:// gets the classic form refused, that credentials ride the CONNECT and never reach the origin, that a portless origin tunnels to :80, and that a flooding proxy does not hang. Closes #564.