added math library

src/main/resources/assets/carpet/scripts/math.scl

@@ -0,0 +1,3 @@
+_euclidean_sq(vec1, vec2) -> reduce(vec1 - vec2, _a + _*_, 0);
+_euclidean(vec1, vec2) -> sqrt(reduce(vec1 - vec2, _a + _*_, 0));
+_vec_length(vec) -> sqrt(reduce(vec, _a + _*_, 0));