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

LOCK(node->m_tx_relay->cs_filter);
                peer_relay_txes = node->m_tx_relay->fRelayTxes;
                peer_filter_not_null = node->m_tx_relay->pfilter != nullptr;
            }
            NodeEvictionCandidate candidate = {node->GetId(), node->nTimeConnected, node->nMinPingUsecTime,
                                               node->nLastBlockTime, node->nLastTXTime,
                                               HasAllDesirableServiceFlags(node->nServices),
                                               peer_relay_txes, peer_filter_not_null, node->addr, node->nKeyedNetGroup,
                                               node->m_prefer_evict, node->addr.IsLocal()};
            vEvictionCandidates.push_back(candidate);
        }
    }
    
    
    
    EraseLastKElements(vEvictionCandidates, CompareNetGroupKeyed, 4);
    
    
    EraseLastKElements(vEvictionCandidates, ReverseCompareNodeMinPingTime, 8);
    
    
    EraseLastKElements(vEvictionCandidates, CompareNodeTXTime, 4);
    
    std::sort(vEvictionCandidates.begin(), vEvictionCandidates.end(), CompareNodeBlockRelayOnlyTime);
    size_t erase_size = std::min(size_t(8), vEvictionCandidates.size());
    vEvictionCandidates.erase(std::remove_if(vEvictionCandidates.end() - erase_size, vEvictionCandidates.end(), [](NodeEvictionCandidate const &n) { return !n.fRelayTxes && n.fRelevantServices; }), vEvictionCandidates.end());
    
    
    EraseLastKElements(vEvictionCandidates, CompareNodeBlockTime, 4);