Add hashing as an alternative to config replace

[joewesch]

Proposed Functionality

When backing up a configuration that has usernames or passwords in clear text (or are easily decipherable), instead of replacing it with a string with re.sub it would be nice if we could instead encrypt it with a hashing algorithm like SHA256.

Use Case

This will allow the user to incorporate their own filter in the intended configuration to generate the intended hash output to be able to verify compliance for those features.