Enable colouring (ie via ansio)

[JoshCheek]

This will enable colouring (example with and without)

It works by allowing the user (or lib such as ansio) to define Sequence fgRed and Sequence fgGreen as appropriate for their system. If these methods are not defined, it defines them such that they do nothing.

The user will have to manually add the lib or methods in their test helper. If they are using ansio, that would look like doFile(System ioPath .. "/ansio.io")

[benmills]

Thanks for the pull request. I just checked in a major refactoring making this not a very clean merge. I'm going to let this hang out until I finish the final part of this refactoring and try to apply this after that.

Otherwise you can close this and pull down development to try to fit it in yourself. If you want to do that talk to me because I think this would make changes in the new Runner system.