[BBD] IMatch 2023 - duplicate appid

[jch2103]

It's great to see IM 2023 available!

I ran into one issue on installation: I get an error message about duplicate appids. See attached screenshot. Not sure how significant this is or what best to do about it. 

[Mario]

There is a md-diff app in your user folder (this is not something IMatch installs).
If you make a copy of an app into your user folder, make sure to give it a unique id in the app.json file.