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Do not show error to user if session data is broken.
Rename `SESSION_REDIS_TTL` to `NEW_SESSION_REDIS_TTL`.
Move session TTL hooks here from Nodeca Users.
Fix fatal error on not found sessions.
Renumber server_chain hooks.
N.settigns.get: Make `params` argument optional.
Drop IP checking at session load stage.

It should be reimplemented as optional hook.
Add enhanced session IP checking hook.
Correct global settings order.