dockerfiles for cli and web

log-level fixes

secure cookie fix

fixed more potential crashes

Fixed crash in web-ui that could be activated without authentication

Security Advisory: dependency ring some AES functions may panic

Security Advisory: removed deprecated lettre_email from the dependencies

that had the `[email protected]` dependency that could potentially cause
segfaults. See: https://rustsec.org/advisories/RUSTSEC-2020-0071

Users are highly advised to update dead-man-switch crates/binaries to
the newest 0.6.0 tag.

All previous 0.5.X versions are yanked from crates.io.

bump deps

Feature: zeroize secrets after use

Bug fix: overflow when calculating durations