Add my changes to the code

[Thomas-Oliv]

Hi, this is my first time really using github so sorry If I made I mistake during the pull request.
Your library for node red is awesome but I felt like the ethernet-in node was lacking in features, specifically towards handshaking between the PLC and the reader/writer. I added another option so that several values can be sent at once at the update of only a single value. When the selected value which I refer to as the flag is changed, all the variables within the configuration node for that node are sent. Rather than those values being in msg.payload, I moved them to msg.values and I kept msg.payload reserved to store the value of the flag, although this could be reversed. Let me know if you guys need anything else from me.

Thanks,

AverageWeeaboo