Both the `app` and `lib` modules had custom source sets configuration originating from the early days of the project. This updates the configuration to match the default Android Studio configuration which will simplify the addition of unit tests and instrumented tests to the project.
Note that for backcompat reasons, some folders (such as the `res` folder in the `app` module) are left as is.
Thaddeus Crews
Fredia Huya-Kouadio
Anish Kumar
Benjamin Dobell
Pāvels Nadtočajevs