Add arrivals (#14755)

* Arrivals

* More arrivals and shitty uhh preload

* cvar

* a

* clockin + maps

* shitter prevention

* Placement

* a

* cvar for tests and dev

* weh

Resources/Locale/en-US/shuttles/arrivals.ftl

@@ -0,0 +1,10 @@
+cmd-arrivals-enable-hint = Enables arrivals
+cmd-arrivals-disable-hint = Disables arrivals
+
+cmd-arrivals-returns = Set arrivals returns to {$value}.
+cmd-arrivals-returns-hint = Toggles allowing players to return via arrivals.
+
+cmd-arrivals-invalid = Invalid arg supplied.
+
+cmd-arrivals-force-hint = Forces players to arrive.
+cmd-arrivals-forced = Forced {$uid} to arrive to the station.