WIP: Implementing arrays into the script, read more

I had intended to solve the Advent of Code puzzles in Toy, but they
don't work without arrays. I wasn't able to enable arrays in time, so
I need to focus on doing things correctly.

The most immediate tasks are marked with 'URGENT', and a lot of tests
need writing.

scripts/advent_1a.toy

@@ -0,0 +1,27 @@
+//advent of code thingy
+var arr = [
+	3,   4,
+	4,   3,
+	2,   5,
+	1,   3,
+	3,   9,
+	3 ,  3
+];
+
+var total = 0;
+var counter = 0;
+
+while (counter < arr.length) {
+	var difference = arr[counter] - arr[counter+1];
+
+	if (difference < 0) {
+		difference = -difference;
+	}
+
+	total += difference;
+
+	counter += 2;
+}
+
+print difference;
+