feat: lisp family improvements: better grammar for Common Lisp; added Racket, Fennel, Hy

[kisaragi-hiu]

I grouped these changes into one PR as they are somewhat related and otherwise I would be about to open a dozen PRs.

The generated / converted / fetched files are added in a separate commit to make it easier to review and/or merge.

Changes in this PR:

• Add support for Racket, Fennel, and Hy.
• Create a new category for Lisp family languages, similar to "Web".
• Call Common Lisp "Common Lisp", not just "Lisp", as otherwise it's not clear if it's referring to a specific language (which would be Common Lisp) or the entire language family.
• Use the Common Lisp grammar from qingpeng9802/vscode-common-lisp, as it highlights Common Lisp code in a much better way than mattn/vscode-lisp or TextMate.

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