Possibly defer UDP send to other plugin

[webmasterkai]

Once we have a reliable plugin that handles TX over UDP/TCP would you consider leaving the UDP handling to that plugin? Perhaps aisreporter works in a similar style to signalk-to-nmea0183 where it does a conversion of SK to another format and then emits it onto the app for others to consume. The first step could simply be adding something like app.emit('aisOut', nmeaString).