title: VS Code debugging prompting for arguments and also setting the working directory
body: <p>I know how to pass fixed arguments in the launch.json, e.g. <a href="https://stackoverflow.com/questions/57889703/in-visual-studio-code-how-to-pass-arguments-in-launch-json">In Visual Studio Code, how to pass arguments in launch.json</a> . What I really need is a prompt where I can give a value for an argument that changes.</p>
  <p>In addition, my argument is a (data) directory for which there is a very ugly long absolute path. I'd really like to be able to set the working directory to a path which contains each of my individual data directories so I only need to provide a relative directory path, i.e. just the directory name.</p>
  <p>I'm working with Python, on Windows (not my choice) using VS Code 1.55.2 (not my choice, either).</p>