Building a VS Tool Window package is easy. Deploying it apparently is not, and because we deploy even at dev time with a setup.exe, we need to deploy it. VS Tool Window packages use WPF UserControls though, so for now we use this separate standalone EXE which uses WPF UserControls.

This is also easier to debug because it can just be rebuilt without affecting Visual Studio. Maybe in the future the VSIP package can just reference this package to and use the user controls, so for debugging and development of this project, it could be used instead.