Are needed for a better error reporting after parsing the schema i.e.

```
enum MyEnum {
  Key1,
  Key2,
  Key3
}

table Test {
  field1: MyEnum = MyEnum.Key1;
  field2: MyEnum = MyEnum.WrongKey;
}

```

I want to report that `MyEnum.WrongKey` is not found but I also want to pint the location (line & col)
Here <https://github.com/bog-dan-ro/flatbuffers/blob/pyfbsc/bin/fbsc.py> is the full parser srcs