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Replaces #354

I didn't reason if it was needed or not, but it is enough to close #354, as this is updated, mergeable, and reviewable.

Note that the changes in lib/raster3d/mask.c might not be needed anymore if the current code was enough, but I included them for the review anyways. See https://github.com/OSGeo/grass/pull/354#discussion_r2030204247, https://github.com/OSGeo/grass/pull/354#discussion_r2030204355, https://github.com/OSGeo/grass/pull/354#discussion_r2030204410