Fixes #528

Kamay authored Apr 24, 2021 and Philipp Hörist committed Apr 25, 2021

The encrypt_file method from PGP module needed a stream instead of
bytes

The returned error from save_to_bufferv() is not always reliable,
and might be True even if saving succeeded.

- Anti Spam
- Message Length Notifier
- OMEMO
- OpenPGP
- PGP
- Tic Tac Toe