* Emergency shuttle is aware of security level (#78271)
## About The Pull Request
The emergency shuttle maintains its security level coefficient and does
the calculation instead of outside procs that aren't aware of what alert
it was when the shuttle was first called.
If the shuttle auto-call timer should be capped at the current security
level timer, that can be done in a different PR.
## Why It's Good For The Game
Fixes https://github.com/tgstation/tgstation/issues/78159
## Changelog
🆑 LT3
fix: Emergency shuttle should correctly scale timer up/down when
changing security levels
/🆑
* Emergency shuttle is aware of security level
---------
Co-authored-by: lessthanthree <83487515+lessthnthree@users.noreply.github.com>
* Fixes security level alerts playing the incorrect sounds
* Fixes the merge conflict
* Slightly improves the code on our end, adds the documentation that we were now missing
Co-authored-by: MrMelbert <51863163+MrMelbert@users.noreply.github.com>
Co-authored-by: GoldenAlpharex <jerego1234@hotmail.com>
