* Utilize the minetest 5.9.0 API that uses radians not degree.
* Simplify computations to make this more efficient, in particular by querying and updating the bone position less frequently.
* Resolves minetest warning `Deprecated call to set_bone_position, use set_bone_override instead` in this location, but other uses remain.
* `mcl_util.set_bone_position` not modified, because it redundantly compares to the previous rotation once more.
Reviewed-on: https://git.minetest.land/VoxeLibre/VoxeLibre/pulls/4622
Reviewed-by: the-real-herowl <the-real-herowl@noreply.git.minetest.land>
Co-authored-by: kno10 <erich.schubert@gmail.com>
Co-committed-by: kno10 <erich.schubert@gmail.com>
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