Make sudo.ps1 support multi-line commands

[Jaykul]

Also, don't assume Length=5 (people may invoke it as sudo.ps1 or as the full path to the script)

I also cleaned up a lot, sorry. And added a settings file for vscode to specify the formatting.

I think we should have tests for this to guarantee the different use cases work (and ensure they keep working when people make changes in the future). Is there a build I can add tests to?