Review Language Highlight Groups

[rbong]

Languages have been very inconsistent in the past.

• Either blue identifiers or white identifiers
• Either green functions or white functions
• Either orange brackets, white brackets, or grey brackets

We do have generic highlight groups, but they're not used.

TreeSitter uses more consistent colors, with different colors for brackets, variables, functions, and special characters.

We should review languages to make sure they're consistent, and potentially remove custom language groups if they're no longer required.

[rbong]

Pretty much all languages now use generic highlight groups like Function, Include, Operator, Special, etc.

This really shouldn't be required for a colorscheme, but what can I say? Vim syntax files are a bit of a mess. It's much better than fixing languages by linking them to different colors one-by-one, which is pretty much what we did before.

Languages should look very similar across the board whether you have TreeSitter highlight enabled or have regex highlighting on top of TreeSitter highlighting.

Sorry if anyone doesn't like the new colors, but nothing was done without reason. I hope you will like that you can switch between languages and still know what different colors mean, and that you can customize language colors globally more easily. If you have color settings that you prefer for Gruvbox that are better, please post them here or in a new issue.

This makes new screenshots a priority, see #97