fix: incorrect syntax highlighting

[tmillr]

These changes might require multiple PR's in order to: quickly deliver highlight fixes, achieve cleaner/smaller pr's, etc.. Feedback and suggestions are welcomed!

It may be possible to refactor all of the palette/* files into a single file? Although I'm not sure if this is something that is wanted or desired, plus after all is said and done, there may remain some custom differences/tweaks among the different colorschemes when it comes to the non-syntax colors/highlights within these files? So for now, I am thinking that it may be best to simply put such questions (of refactoring, etc.) off until later, and in the meantime just develop a new file/module containing all of the common mappings (from hl-group to primer primitives color) that will then be required() within each of the palette/* files.

Todo's, Notes, Ideas, Considerations, Etc.

• [x] Handle rgb() and rgba() color strings (not applicable to pl syntax colors)
• [ ] Interaction with user config and overrides
• [ ] Interaction with colorscheme compilation?
• [ ] Tests (at least manual testing/debugging for now, but ultimately proper tests ideally)
• [x] Go over TODO comments
• [x] Relocate + rename newly introduced types as needed
• [ ] Update CHANGELOG.md
• [x] Update other docs
• [x] Cleanup commits and commit messages
• [ ] Cleanup PR description

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See #252

[tmillr]

Should be ready to merge soon! 👍 (next 2-3 days)

[tmillr]

@ful1e5 I think this one is pretty much ready (although it depends on #273 so that should be merged first). I think that further refinements such as tweaking highlights even further, refactoring, or addressing less commonly used languages, etc., can come later if needed. I didn't touch the CHANGELOG.

This pr ended up touching many files so it may be easier to view the diffs one commit at a time. Thanks

[tmillr]

Please make the necessary changes to README.md#Configuration.

Oops. Sorry for missing that.

See cb601d80975e57447b8bf94a2c2f73e99968ddcd