Add coloring for support.type scope

spacegray didn't have styling defined for support.type, which is most notably used for CSS properties. As a result properties and values look identical. I updated this in all three themes using the existing color for support.function, which doesn't seem to overlap with anything in CSS or Sass files.

I'll defer to you on if another color might be better, but having this scope distinguished is something themes like Monokai do and it's really nice in my opinion.