Explorer Overhaul and Gateway Retirement (#20855)

* Adds Explorer spawnability, removes Cyberaid gateways

* deletes some REALLY old bloat maps and deletes Gateway.dm

* Fixes runtime, and removes more stuff like gateway config... cause we dont have a gateway anymore

* removes all mention of /obj/machine/gateway

* Goodbye test_tiny and evil_santa 😈

* removed a literal fucking pamphlet

* changes map area name from Gateway to Expedetition

* changes the access from ACCESS_GATEWAY to ACCESS_EXPEDITION

* Revert "Goodbye test_tiny and evil_santa 😈"

This reverts commit eda775ecd5.

* ok deletes evil_santa only

* Fixes a runtime

* Adds new visuals for new area and explorer spawn marker

* Unhides explorers from the pref menu

* adds spawns and fixes the gateways for all maps, adds Expedition room to Cere

* improves and cleans up the expedition room maps, also clothes for Explorers

* GET OUT OF HERE EXAMPLE.

* byebye button

code/game/objects/structures/stool_bed_chair_nest/wheelchair.dm

@@ -76,7 +76,7 @@
 	if(!has_buckled_mobs())
 		return
 	var/mob/living/buckled_mob = buckled_mobs[1]
-	if(istype(A, /obj/machinery/door) || istype(A, /obj/machinery/gateway))
+	if(istype(A, /obj/machinery/door))
 		A.Bumped(buckled_mob)
 
 	if(propelled)