@:nativeGen for HaxeProperties.hx

Fixes:

C:\\Users\\Matthew\\Downloads\\unihx-development\\unihx-development\\unihx\\_internal\\editor\\HaxeProperties.hx(13,46): error CS0266: Cannot implicitly convert type `object' to `UnityEngine.Vector2'. An explicit conversion exists (are you missing a cast?)
Merge pull request #2 from m22spencer/development

@:nativeGen for HaxeProperties.hx