Fix drawOrder loading values

Currently, the drawOrder loader completely misloads draworder changes (create a animation that changes the draworder and see for yourself).
This happens because the original drawOrderValues is a list and (at least on my version of Haxe), the dynamic object from Json behaves as one and therefore the `fields()` function returns `length` and `__s`.
Try to `trace(drawOrderValue)` to see what I mean.