Adds access_xenoarch "Xenoarchaeology"

* Tested this, it works with the ID computer and with scientists on
spawn-in
* Scientists hold on to their access to xenoarch for now
Changed research outpost doors to access_xenoarch

* Most (if not all) doors on the research outpost now require access to
"Xenoarchaeology" ("65" for mappers)
Updating the changelog
Changelog again
Merge pull request #3078 from Zuhayr/master

Some embedding fixes for unforeseen consequences, plus armalis.
Merge pull request #3061 from Kilakk/bleeding-edge-freeze

Added access_xenoarch
Merge remote-tracking branch 'upstream/bleeding-edge-freeze' into bleeding-edge-freeze
Adds a crew transfer notice for new players

Adds the "The station is currently undergoing evacuation procedures"
notice for new people trying to join when there's a crew transfer going
on.
Merge pull request #3083 from Kilakk/bleeding-edge-freeze

Adds a crew transfer notice for new players joining
Ninja update, Several nerfs and tweaks
Air alarm improvements.  Adds Central Atmos Control and a buffer between server room and station.
Fixes #3074
Fixes #3069
Fixes #2909
Merge pull request #3089 from SkyMarshal/airfixes

Air alarm improvements.  Adds Central Atmos Control and a buffer between server room and station.
Bugfixes for windoor construction.
Code cleanup.
Adding construction of req_one_access doors.
Adding removal of electronics out of broken/emagged windoors.
Misclick fix.
Changelog update.
Better term.
Missed a line.