libevent seems to have invaded `libbitcoin_common` via `url.cpp`

`url.cpp` is used only from `test/fuzz/string.cpp` and `wallet/rpcwallet.cpp`

libevent should only be required for bitcoind, bitcoin-cli and (due only to the hack of passing wallet names) bitcoin-qt

args.insert(args.begin() + 1, walletPass);
        }
        if (gArgs.GetBoolArg("-stdin", false)) {
            
            std::string line;
            while (std::getline(std::cin, line)) {
                args.push_back(line);
            }
            if (StdinTerminal()) {
                fputc('\n', stdout);
            }
        }
        std::unique_ptr<BaseRequestHandler> rh;
        std::string method;
        if (gArgs.GetBoolArg("-getinfo", false)) {
            rh.reset(new GetinfoRequestHandler());
            method = "";
        } else {
            rh.reset(new DefaultRequestHandler());
            if (args.size() < 1) {
                throw std::runtime_error("too few parameters (need at least command)");
            }
            method = args[0];
            args.erase(args.begin()); 
        }
        
        const bool fWait = gArgs.GetBoolArg("-rpcwait", false);
        do {
            try {
                const UniValue reply = CallRPC(rh.get(), method, args);