def load_files(self):
        self._load_file(prefix='system')
        self._load_file(prefix='user')
        self._load_file(prefix='project')
        self._load_file(prefix='runtime', absolute=True)
Forbids multi-line headers, to prevent header injection.
dataset/ETHPy150Open pyinvoke/invoke/invoke/config.py/Config.load_files--crossover with--dataset/ETHPy150Open CollabQ/CollabQ/vendor/django/core/mail.py/forbid_multi_line_headers