To be able to label incoming tor connections as different from normal localhost connections in e.g. `getpeerinfo` and the peers list in the GUI it'd be useful to have them connect on an alternative local-only port. Or even better, a UNIX socket.

For manually set-up hidden services this would have to be configured manually and could add a `hsport` option or such. The external port would still appear as `XXXXXXXXX.onion:8333`, however internally it would redirect to a that port.

In the case of `torcontrol` this would be easy to set up automatically. It could add a new (localhost) binding port automatically and this code would have to be changed:
- https://github.com/bitcoin/bitcoin/blob/master/src/torcontrol.cpp#L441
- https://github.com/bitcoin/bitcoin/blob/master/src/torcontrol.cpp#L477

if (args.IsArgSet("-dustrelayfee")) {
        CAmount n = 0;
        if (!ParseMoney(args.GetArg("-dustrelayfee", ""), n))
            return InitError(AmountErrMsg("dustrelayfee", args.GetArg("-dustrelayfee", "")));
        dustRelayFee = CFeeRate(n);
    }
    fRequireStandard = !args.GetBoolArg("-acceptnonstdtxn", !chainparams.RequireStandard());
    if (!chainparams.IsTestChain() && !fRequireStandard) {
        return InitError(strprintf(Untranslated("acceptnonstdtxn is not currently supported for %s chain"), chainparams.NetworkIDString()));
    }
    nBytesPerSigOp = args.GetArg("-bytespersigop", nBytesPerSigOp);
    if (!g_wallet_init_interface.ParameterInteraction()) return false;
    fIsBareMultisigStd = args.GetBoolArg("-permitbaremultisig", DEFAULT_PERMIT_BAREMULTISIG);
    fAcceptDatacarrier = args.GetBoolArg("-datacarrier", DEFAULT_ACCEPT_DATACARRIER);
    nMaxDatacarrierBytes = args.GetArg("-datacarriersize", nMaxDatacarrierBytes);
    
    SetMockTime(args.GetArg("-mocktime", 0)); 
    if (args.GetBoolArg("-peerbloomfilters", DEFAULT_PEERBLOOMFILTERS))
        nLocalServices = ServiceFlags(nLocalServices | NODE_BLOOM);
    if (args.GetArg("-rpcserialversion", DEFAULT_RPC_SERIALIZE_VERSION) < 0)
        return InitError(Untranslated("rpcserialversion must be non-negative."));
    if (args.GetArg("-rpcserialversion", DEFAULT_RPC_SERIALIZE_VERSION) > 1)
        return InitError(Untranslated("Unknown rpcserialversion requested."));
    nMaxTipAge = args.GetArg("-maxtipage", DEFAULT_MAX_TIP_AGE);
    if (args.IsArgSet("-proxy") && args.GetArg("-proxy", "").empty()) {
        return InitError(_("No proxy server specified. Use -proxy=<ip> or -proxy=<ip:port>."));
    }
    return true;
}
static bool LockDataDirectory(bool probeOnly)