Add casing to from_dict method

[nedopolz]

Summary

from_dict method did not support casing

What is the feature request for?

The core library

The Problem

When using to_dict method I can pass case, but for from_dict method only safe_snake_case is available, It looks like some inconsistent behavior

The Ideal Solution

As i understand safe snake case is not necessarily needs to be safe, so replacing it with any casting method would be safe

The Current Solution

Just use snakecase in dict