Fiddling with cooldown times
Removed a silly duplicate entry in the changelog
making a generic version of the AI's visibility code so that it can be reused by the Cult Spirits
Merge pull request #3819 from Kilakk/dev

Added the ability to send faxes between departments
* fixing the visibility update loop through the dictionary
* moving the standard turf and object update triggers to the visibility_network update_triggers.dm file
Merge remote-tracking branch 'upstream/master' into dev
Added the Booze Dispenser, the Soda Dispenser, the Bluespace Beaker, and the Cryostasis Beaker.
Actually added the new beakers. Yay for git.
Removed a useless variable, and changed the lists modifications to use += and -=
Added vending machine stocking

* Now with more del() than ever before
* Only works if you have the maintenance panel open
Merge pull request #3825 from Kilakk/dev

Added vending machine stocking
Fixed the Glass.dm can_be_placed_into list.
Fixed beakers not going into DNA scannners.
Fixed the absent/removed sprite on experimental welding tools.
Added in two new manuals by Magmaram for atmospherics and EVA.
Added two new manuals by MagmaRam to the default engineering manual bookcase.
Updated sprites for the Captain and Centcomm stamps to look a bit more distinctive and official.
Added in sprites for two new manuals by MagmaRam.
Merge pull request #3823 from Iamgoofball/boozetaketwo

Added the Booze Dispenser, the Soda Dispenser, the Bluespace Beaker, and the Cryostasis Beaker.
Merge pull request #3831 from Nanai/dev

Guide/Manual addition, sprite fix!