Use password_hash() and friends to hash and verify passwords

Previously I rolled my own password hashing function. While it at least
used some sort of salt, it's still a terrible idea.

The newly created class PasswordHash wraps the password_hash() family of
functions but can also check the old password hash format (to distinguish
them, the new password hashes are prefixed with a '!'). In
PasswordHash::needsRehash we then always report an hash of the old format
as being in need of a rehash. That way, these old hashes will be replaced
the next time the user successfully logs in.

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