Description of the new feature/enhancement

Currently colors in the config are names in what arguably is a somewhat confusing way. E. g. it's not immediately obvious what "BrightBlack" or "BrightWhite" actually is.

It's also not clear if those names are consistent with any other public color names?

Proposed technical implementation details

Can we reuse .NET's ConsoleColor enum instead?
https://docs.microsoft.com/en-us/dotnet/api/system.consolecolor?view=netframework-4.8

It's already used in .NET and powershell, and is widely known.