deliver method
Sends an event if it matches a filter and the scope allows it.
Implementation
@override
void deliver(FreedomeEvent e) {
if (!_welcomed || _closed) return;
if (!filters.any((f) => DomeTopics.matches(f, e.topic))) return;
if (!allowed(e.topic)) return;
final j = e.toJson();
socket.send(jsonEncode(j));
}