SdlHintCallback typedef
        SdlHintCallback =
     Void Function(Pointer<NativeType>  userdata, Pointer<Utf8>  name, Pointer<Utf8>  oldValue, Pointer<Utf8>  newValue)
    
    
    
Implementation
typedef SdlHintCallback =
    Void Function(
      Pointer<NativeType> userdata,
      Pointer<Utf8> name,
      Pointer<Utf8> oldValue,
      Pointer<Utf8> newValue,
    );