Add a waggle plugin for the FD-70

### What instrument do you want a plugin for?

The Vaisala FD70 is the leading forward scatter technology for visibility and present weather, including runway visual range (RVR). It sets the standard in airport weather accuracy, detecting 100% of precipitation from the lightest drop to the end of the storm.

### When do you need this plugin written by?

I need this by July 2023!