update IsGuestKey for webclient guests

Signed-off-by: Mloc-Argent <colmohici@gmail.com>
Merge pull request #6920 from mwerezak/handcuffs

Fixes bad handcuff check
Merge pull request #6905 from MrSnapwalk/propagandabot3000

Adds Matthew951's custom borg sprite to custom-synthetic.dmi.
Merge pull request #6911 from mwerezak/he-pipes

Fixes #6910
Fixes #6660

Also makes flipping tables block climbing.
Merge pull request #6851 from RavingManiac/dev

Breakable doors, door and window damage messages
Merge pull request #6912 from mwerezak/boatswain

Adds sound for the captain-spawning announcement
Merge pull request #6908 from PsiOmegaDelta/NastyVoices

Nasty voices and now noises
Merge pull request #6903 from mwerezak/bite

Adjusts secondary unarmed attacks
Merge pull request #6907 from PsiOmegaDelta/EmergencyShutters

(De)constructable emergency shutters.
Merge pull request #6916 from Mloc/bs12-server

serverside fixes
Merge pull request #6919 from mwerezak/custom-loadout

Custom loadout updates
Merge pull request #6914 from PsiOmegaDelta/Bolts

More Mapping
Merge pull request #6915 from PsiOmegaDelta/Changelog

Changelog update.
Merge pull request #6923 from mwerezak/climbing

Fixes #6660
Adds Searif's leather jackets as a custom gear
Adds atmos venting tower

Should help atmos techs deal with hot gas blocking the scrubber line in
emergencies.
Merge remote-tracking branch 'upstream/dev' into fire-extinguishers
Moves venting tower
Fixes #6355

Not sure why it was commented it out, but it seems to be the cause of
the layer issues.