Add dataclasses.py to fix python 3.6 backward compatibility
Add dataclasses.py to fix python 3.6 backward compatibility

Vector35/binaryninja-api,Vector35/binaryninja-api,Vector35/binaryninja-api,Vector35/binaryninja-api,Vector35/binaryninja-api,Vector35/binaryninja-api,Vector35/binaryninja-api