instead of hundreds of nodeboxes per.
fixes bad rotation that was introduced with fd1e5a516a (because nodeboxes can't be wallmounted, and facedir != wallmounted param2) requires minetest from git commit dd4c21c1808acedfbcf8402c09ce9129b6ac31c7 or later.
fd1e5a516a
uses new fan blades object for recipe