Convert the remaining batch of *.fnl files

[russtoku]

Converted clients and related modules (not tested):

• Guile
• Janet
• Rust

Converted Clojure client-related files (somewhat tested by running Clojure client agains dev/clojure/sandbox.cljc):

• action.fnl
• auto-repl.fnl
• debugger.fnl
• init.fnl
• parse.fnl
• server.fnl
• state.fnl
• ui.fnl

Converted remaining legacy tests.

[Olical]

Looks perfect! Removed a couple more *module* references too. I think I'll give this a bit of smoke testing, rename the branch to main then create a discussion post explaining the migration and encourage those who can to move over to it and report back in with issues or a 👍🏼 if things are okay for them.

Thank you so much for all of the work you've done on this, it's been amazing! You've pushed this boulder up and over the top of the mountain that I kept putting off. Once this is stable we can make so many changes so much easier with LSP support and a much lower barrier to entry.