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

"Could not locate RPC credentials. No authentication cookie could be found, and RPC password is not set.  See -rpcpassword and -stdinrpcpass.  Configuration file: (%s)",
                GetConfigFile(gArgs.GetArg("-conf", BITCOIN_CONF_FILENAME)).string()));
        } else {
            throw std::runtime_error("Authorization failed: Incorrect rpcuser or rpcpassword");
        }
    } else if (response.status >= 400 && response.status != HTTP_BAD_REQUEST && response.status != HTTP_NOT_FOUND && response.status != HTTP_INTERNAL_SERVER_ERROR)
        throw std::runtime_error(strprintf("server returned HTTP error %d", response.status));
    else if (response.body.empty())
        throw std::runtime_error("no response from server");
    
    UniValue valReply(UniValue::VSTR);
    if (!valReply.read(response.body))
        throw std::runtime_error("couldn't parse reply from server");
    const UniValue reply = rh->ProcessReply(valReply);
    if (reply.empty())
        throw std::runtime_error("expected reply to have result, error and id properties");
    return reply;
}
static int CommandLineRPC(int argc, char *argv[])
{
    std::string strPrint;
    int nRet = 0;
    try {
        
        while (argc > 1 && IsSwitchChar(argv[1][0])) {
            argc--;
            argv++;
        }
        std::string rpcPass;
        if (gArgs.GetBoolArg("-stdinrpcpass", false)) {