Updates the copyright to 2021 for all files that have a copyright. Files in our source code without the copyright header still do not receive one automatically. Additionally, backlisted files are also excluded.
Previously the copyright of chiliproject which references redmine stated a copyright of redmine up to and including 2017 which is not true for the code we have in here. Because of that I changed that to 2013
This adds a typed userpassword class for Bcrypt password hashes
that replace the previous default of salted SHA1.
It still provides a class for SHA1 passwords, however new passwords of
that type may no longer be created directly, and passwords are checked
whether to upgrade them on every login.