Currently the `getnetworkinfo` returns something like: 

```
"localservices": "0000000000000449",
```

Manually parsing this consistently gives me a headache (see also https://github.com/sipa/bitcoin-seeder/pull/77).

It would be useful to parse this and show the right combination of `NODE_NETWORK`, `NODE_GETUTXO`, `NODE_BLOOM`, `NODE_WITNESS`, `NODE_NETWORK_LIMITED` and `NODE_COMPACT_FILTERS`. In addition the help text for `getnetworkinfo` could be expanded to mention the right BIP numbers for known flags.

There is some ad hoc parsing to populate e.g. `localrelay`, etc (?).  Their help text could also refer back to `NODE_GETUTXO`.

See also: https://en.bitcoin.it/wiki/Protocol_documentation#Network_address
{
            RPCHelpMan{"clearbanned",
                "\nClear all banned IPs.\n",
                {},
                RPCResults{},
                RPCExamples{
                    HelpExampleCli("clearbanned", "")
                            + HelpExampleRpc("clearbanned", "")
                },
            }.Check(request);
    if (!g_banman) {
        throw JSONRPCError(RPC_DATABASE_ERROR, "Error: Ban database not loaded");
    }
    g_banman->ClearBanned();
    return NullUniValue;
}
static UniValue setnetworkactive(const JSONRPCRequest& request)