(chore) Clean up linting

[Hirse]

Changes

• Remove JSHint config
• Switch ESLint config to JSON (for JSON-schema support)
• Change npm lint script to include src/plugins folder
  • Fix some linting issues in the vue plugin
  • Fix some linting issues in the merge_html plugin
• Add lint-languages npm script
• Clean up lint workflow
  • Use latest node
  • Use npm ci for faster and more reliable dependency installs
  • Use new npm lint scripts
• Add new ESLint configs for test and tools, which are not included in CI, but help during development

Checklist

• Added markup tests, or they don't apply here because it's not a code change
• Updated the changelog at CHANGES.md - NA?

[Hirse]

@joshgoebel would you mind giving this another look?

[joshgoebel]

What is the advantage of JSON again? It's very hard to review because JSON forces every single line to change when really nothing has changed.

[Hirse]

What is the advantage of JSON again?

JSON can be validated with a schema. In some editors (I'm using VSCode) this is built-in and gives a great experience:

It's very hard to review because JSON forces every single line to change when really nothing has changed.

I don't quite understand what you mean here.

[joshgoebel]

JSON can be validated with a schema.

Yes, that's true... though technically there is no reason it couldn't do the same exact thing based on the name of the file and using the default export... but whatever.

I don't quite understand what you mean here.

Instead of the diff showing what actually changed (a few lines) it just shows 200 lines removed, 200 lines added, etc... making it very hard to review. So I have to scroll thru the file manually comparing one line at a time visually... because I'm pretty sure at first glance you changed a few things and removed some of my comments, etc... And that is why I haven't found the time to sort this out yet. It's on the list to get to though.

[Hirse]

I've reverted the change to json (for this PR) and minimized the changes for easier comparison and reviewing.

[joshgoebel]

and minimized the changes for easier comparison and reviewing.

OMG, 100x better. Thank you.

[joshgoebel]

@Hirse Thanks!