Timer
A NetMQTimer allows actions to be performed periodically. Timer instances may be added to a NetMQPoller, and their
Elapsed event will fire according to the specified Interval and Enabled property values.
The event is raised on the poller's thread.
``` csharp var timer = new NetMQTimer(TimeSpan.FromMilliseconds(100)); timer.Elapsed += (sender, args) => { / handle timer event / }; using (var poller = new NetMQPoller { timer }) { poller.Run(); }