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 (!block_notify.empty()) {
        uiInterface.NotifyBlockTip_connect([block_notify](SynchronizationState sync_state, const CBlockIndex* pBlockIndex) {
            if (sync_state != SynchronizationState::POST_INIT || !pBlockIndex) return;
            std::string command = block_notify;
            boost::replace_all(command, "%s", pBlockIndex->GetBlockHash().GetHex());
            std::thread t(runCommand, command);
            t.detach(); 
        });
    }
#endif
    std::vector<fs::path> vImportFiles;
    for (const std::string& strFile : args.GetArgs("-loadblock")) {
        vImportFiles.push_back(strFile);
    }
    g_load_block = std::thread(&TraceThread<std::function<void()>>, "loadblk", [=, &chainman, &args] {
        ThreadImport(chainman, vImportFiles, args);
    });
    
    {
        WAIT_LOCK(g_genesis_wait_mutex, lock);
        
        
        
        while (!fHaveGenesis && !ShutdownRequested()) {
            g_genesis_wait_cv.wait_for(lock, std::chrono::milliseconds(500));
        }
        block_notify_genesis_wait_connection.disconnect();
    }
    if (ShutdownRequested()) {
        return false;