Run configuration for nunit

Like in IntelliJ, it could be great to be able to create run configurations for nunit tests, with:

* environment variable setup

* working dir

* pipe of stderr and stdout, toward console and file

* selection of tests to run via where expression (categories ...)

and other options like nunit3-console.exe interface (see https://github.com/nunit/docs/wiki/Console-Command-Line)