It was the community version of Rachio Integration written by Anthony Santilli. I admit I didn't keep up with any changes in the original code base, the version I had "compiled" and I fixed issues with the rain delay functions and added the ability to change the prefix for all the child devices from "Rachio" to a defined value in the App preferences.
I think I could use the built-in driver if the issues with the rain delay functions (I'm guessing the built-in driver is based off of this one also) that I reported here Rachio Rain Delay not working were fixed.
I don't mean to take up anyone's time trying to debug my custom code. I'm just asking if there was an announcement of this import being taken away and whether it was done deliberately or inadvertently.