Additional Flow Sensor Support Flowmec QS200

@ronjonp I was hoping this was the gentle nudge that would get it implemented. I am hoping that @franz or @mckynzee will help us all out by implementing the vendor agnostic custom sensor Kfactor and Offset values to be in the app. But I suspect this may also require controller firmware that is not implemented. So, I will take what I can get. :slight_smile: