This pull request renames buckets so that they use the `mcl_` naming convention.
I originally was going to do some renaming on a bigger scope, but decided against it for now.
Reviewed-on: https://git.minetest.land/MineClone2/MineClone2/pulls/3708
Reviewed-by: ancientmarinerdev <ancientmariner_dev@proton.me>
Co-authored-by: FossFanatic <fossfanatic@noreply.git.minetest.land>
Co-committed-by: FossFanatic <fossfanatic@noreply.git.minetest.land>
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