Handle Forward References

[bpeake-illuscio]

New attempt to close issue #15
Last attempt: #25

This version is significantly less invasive. It still relies on passing a dict of forward references to the Config class, these are then passed to the globalns param of typing.get_type_hints(), cleaning each type hint of forward refs.

The resolved types are injected into the rest of the code by creating a copy of each dataclass.Field object in the main loop, and reassigning the .type attr to the cleaned type.

Each new field object then carries forward the correct type to the rest of the logic.

Let me know what you think!

[konradhalas]

@bpeake-illuscio this is exactly what we are looking for. Very good job!

Give me some time to proper review, nevertheless this change looks awesome.

[bpeake-illuscio]

Thanks! Glad you like it at first glance. Let me know if you have any tweaks once you do a proper review.

[konradhalas]

@bpeake-illuscio looks very good, merged! :)