fix: update password generation and remove passlib dependency

[Samk13]

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Description

• fix: ImportError: cannot import name 'str_to_uascii' from 'passlib.utils.compat' (unknown location)

• Replace passlib's password generation with a custom function.

• Update copyright information in hash.py and clean up unused imports.

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[utnapischtim]

can we remove this also with pythons stdlib?

[Samk13]

Would adding the dependency libpass to the requirements address this without changing this import? similar to inveniosoftware/flask-security-fork#91 or its not needed once merged?

[utnapischtim]

yes, would work. i thought, since you replaced the pwd.genword function with an stdlib approach, it would be possible to replace the rest too.

adding libpass to flask-security-fork is enough, it doesn't have to be here too.