Decide randomness once and for all

assets/examples/array.rhea

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+var std = include "std";
+var print = std.print;
+
+func main(){
+    var arr = [123, 456, 789];
+    print(arr[1]);
+}

assets/examples/rand.rhea

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+var rand = include "rand";
+var rd64 = rand.random_u64;
+
+func main(){
+    var abc = rd64();
+}

assets/libraries/rand/rand.rhea

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+func random_u64(){
+    // TODO: randomness
+    return 3;
+}