[Suggestion] Use libby instead of LibraryLoader

[HaHaWTH]

What feature do you want to see added?

I saw changes in the latest PR #2806 , will AuthMe drop support for versions older than 1.16-?

Maybe we could use libby to download libraries dynamically instead of using SpigotLibraryLoader, also can keep compatibility to older versions.

Are there any alternatives?

Already described above

Anything else?

No response