Initial work on rune as scripting library

tests/data/scripts/moves/test.rn

@@ -0,0 +1,13 @@
+mod moves {
+
+struct TestMove;
+
+impl TestMove {
+    pub fn change_speed(self, choice, speed) {
+        println(`change_speed: ${choice.speed()}`);
+        println(`user level: ${choice.user().level()}`);
+        speed.value = 100;
+    }
+}
+
+}