Mesh Simplification is incomplete after one pass

[zalo]

@elalish It seems like there's room for additional simplification after one pass; perhaps topology should be simplified until no changes are made?

    general_offset = nonConvex.minkowski_sum(nonConvex.scale([0.5, 0.5, 0.5]))
    for i in range(5):
        save_mesh(general_offset, "general_offset_"+str(i), "stl")
        general_offset = general_offset.as_original()

Pass 0:

Pass 1:

Pass 2: