reorganized build-ins and implement a circular queue as an example

misc/deepfailure.noja

@@ -0,0 +1,14 @@
+
+fun fail_at_depth(depth) {
+
+	fun fail(current_depth) {
+
+		assert(current_depth < depth);
+
+		fail(current_depth + 1);
+	}
+
+	fail(0);
+}
+
+fail_at_depth(9);