Doesn't Suport Dart Language

[doubleyooz]

Using flutter / dart the language has no formatting in its color, only the words (class, extends, override, return) text and comments are in different colors.

[bceskavich]

The way this theme is set up, there's some basic cross-language syntax highlighting support with language-specific configurations layered on top. The cross-language syntax highlighting honestly could be improved. I'd like to see it touch on more shared syntax items so that "unsupported" languages have better out of the box coloring.

But for now, to get Dart supported, we'd need to add a dart.ts file with its various configurations under src/settings/tokens/languages.

You're welcome to open a PR to add that config and get Dart supported. Otherwise, I'll try to find the time to do so in the near future.