✨ Improve Default Syntax Highlighting Colors and Font

[austincondiff]

I believe they use their own SF Mono font.

Our syntax highlighting looks pretty gross in comparison to Xcode.

[austincondiff]

On the subject of themes, each theme will be required to have a light mode and a dark mode which will respond to the users light/dark mode setting. We will have a setting to use the themes background, or use the standard window background which is tinted by your wallpaper. On that note, see #46.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[austincondiff]

Closing, this was resolved.