Added remote ip and port to OscPacket and set in UDPListener.

[johnebgood]

Many OSC implementations have OSC addresses that will call back with data to the origin IP and port.
For example if I make an OSC call to address /GetCurrentValues it will return data to the address /CurrentValues on the IP and port of the sender. This makes it possible to return information about state from an OSC server based on a call.

I added remoteIPAddress and remotePort to OSCPacket which is set on the UDPListener ReceiveCallback(). This allows the ability to craft a response.

From UDPListener:ReceiveCallback():

packet = OscPacket.GetPacket(bytes);
packet.remoteIPAddress = RemoteIpEndPoint.Address.ToString();
packet.remotePort = RemoteIpEndPoint.Port;

Example callback use case:

                if (address == "/GetCurrentValues")
                {
                    // Must have at least one value passed.
                    int dummy = (int)message.Arguments[0];

                    cameraControl.Get(CameraControlProperty.Pan, out int currentPan, out var flags1);
                    cameraControl.Get(CameraControlProperty.Tilt, out int currentTilt, out var flags2);
                    cameraControl.Get(CameraControlProperty.Zoom, out int currentZoom, out var flags3);
                    cameraControl.Get(CameraControlProperty.Focus, out int currentFocus, out var flags4);

                    Console.WriteLine($"Sending Current PTZ: {currentPan} {currentTilt} {currentZoom} {currentFocus} \n");
                    Console.WriteLine($"To: {remoteIPAddress}:{remotePort}\n");

                    var responseMessage = new SharpOSC.OscMessage("/CurrentValues", currentPan, currentTilt, currentZoom, currentFocus, theDevicePath);
                    var sender = new SharpOSC.UDPSender(message.remoteIPAddress, message.remotePort);

                    sender.Send(responseMessage);
                }