Large amounts of work on Rune

tests/data/scripts/moves/test.rn

@@ -6,7 +6,8 @@ impl TestMove {
     pub fn change_speed(self, choice, speed) {
         println(`change_speed: ${choice.speed()}`);
         println(`user level: ${choice.user().level()}`);
-        speed.value = 100;
+        println(`owner: ${self.owner.level()}`);
+        speed += 100;
     }
 }