voronoi noise 3D first attempt

src/experimental/_impl/_nz_voronoi3_impl.scad

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+use <experimental/_impl/_nz_worley3_impl.scad>;
+use <util/sort.scad>;
+    
+function _nz_voronoi3(p, seed, dim, m, n, o) = 
+    let(
+        fcord = [floor(p[0] / m), floor(p[1] / n), floor(p[2] / o)],
+        nbrs = _neighbors(fcord, seed, dim, m, n, o),
+        dists = [
+            for(nbr = nbrs) 
+                if(!is_undef(nbr[1])) // Here's a workaround for a weired undef problem. bug of 2019.05? 
+                    [norm(nbr - p)]
+        ],
+        sorted = sort(dists)
+    )
+    sorted[1][0] - sorted[0][0];

src/experimental/nz_voronoi3.scad

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+use <util/rand.scad>;
+use <experimental/_impl/_nz_voronoi3_impl.scad>;
+
+function nz_voronoi3(size, x, y, z, seed, dim = 2) =
+    let(
+        sd = 6 + (is_undef(seed) ? floor(rand(0, 256)) : seed % 256),
+        // m*n pixels per grid
+        m = size[0] / dim,
+        n = size[1] / dim,
+        o = size[2] / dim
+    )
+    _nz_voronoi3([x, y, z], sd, dim, m, n, o);