Cleans up a lot of globals a few other vars (#23246)

* i hate globals i hate globals

* more fucking of these

* sirryan review

code/game/gamemodes/changeling/changeling.dm

@@ -1,6 +1,7 @@
 #define LING_FAKEDEATH_TIME					50 SECONDS
 #define LING_ABSORB_RECENT_SPEECH			8	//The amount of recent spoken lines to gain on absorbing a mob
 
+// This list is basically a copy of GLOB.greek_letters, but it also removes letters when a changeling spawns in with that ID
 GLOBAL_LIST_INIT(possible_changeling_IDs, list("Alpha","Beta","Gamma","Delta","Epsilon","Zeta","Eta","Theta","Iota","Kappa","Lambda","Mu","Nu","Xi","Omicron","Pi","Rho","Sigma","Tau","Upsilon","Phi","Chi","Psi","Omega"))
 
 /datum/game_mode

code/game/gamemodes/cult/cult_mode.dm

@@ -1,5 +1,3 @@
-GLOBAL_LIST_EMPTY(all_cults)
-
 /datum/game_mode
 	/// A list of all minds currently in the cult
 	var/list/datum/mind/cult = list()

code/game/gamemodes/cult/runes.dm

@@ -1,5 +1,4 @@
 GLOBAL_LIST_EMPTY(sacrificed) // A mixed list of minds and mobs
-GLOBAL_LIST_EMPTY(wall_runes) // A list of all cult shield walls
 GLOBAL_LIST_EMPTY(teleport_runes) // I'll give you two guesses
 
 /*
@@ -716,12 +715,10 @@ structure_check() searches for nearby cultist structures required for the invoca
 
 /obj/effect/rune/wall/Initialize(mapload)
 	. = ..()
-	GLOB.wall_runes += src
 	B = new /obj/machinery/shield/cult/barrier(loc)
 	B.parent_rune = src
 
 /obj/effect/rune/wall/Destroy()
-	GLOB.wall_runes -= src
 	if(B && !QDELETED(B))
 		QDEL_NULL(B)
 	return ..()

code/game/gamemodes/miniantags/abduction/abduction.dm

@@ -47,7 +47,7 @@
 
 /datum/game_mode/abduction/proc/make_abductor_team(team_number,preset_agent=null,preset_scientist=null)
 	//Team Name
-	team_names[team_number] = "Mothership [pick(GLOB.possible_changeling_IDs)]" //TODO Ensure unique and actual alieny names
+	team_names[team_number] = "Mothership [pick(GLOB.greek_letters)]" //TODO Ensure unique and actual alieny names
 	//Team Objective
 	var/datum/objective/experiment/team_objective = new
 	team_objective.abductor_team_number = team_number