Signature plugin

[Te-k]

Extract signature from PE file, some references :

• https://github.com/sebdraven/verify-sigs
• https://stackoverflow.com/questions/45782506/is-there-any-python-package-for-parsing-pkcs7
• https://github.com/DidierStevens/DidierStevensSuite/blob/master/disitool.py
• https://bartkozpoznania.wordpress.com/2013/08/22/extracting-digital-signature-pkcs7-from-signed-pe-files/
• https://github.com/viper-framework/viper/blob/master/viper/modules/pe.py