Full revert of #79995 (tri-ai station trait). Partal revert of #81681 (human ai) (#84850)

#79995 removed the verb and secrets button for no reason. This means you
can no longer decide to do tri-ai in the lobby, you have to do it next
round or make players suffer thru another init cycle.

**__In general systems that require things be decided the previous round
are really fucking annoying and should be minimized to only specific
things that absolutely have to for technical reason.__**

This is not one of them.

I do not have the time to redesign the station trait to make use of the
existing admin code so this is a full revert instead.

If the station trait is re-added, it should be done so without removing
the secrets button or admin verb.

#81681 had an undocumented and un-atmoized change, in that it removed a
job related signal needlessly, that undocumented change has been
reverted because this system used that signal.

@Fikou 
@JohnFulpWillard 

(also cc @tralezab and @Ghommie as you merged the reverted prs)

code/modules/admin/verbs/ai_triumvirate.dm

@@ -0,0 +1,49 @@
+
+///global reference to the current theme, if there is one.
+GLOBAL_DATUM(triple_ai_controller, /datum/triple_ai_controller)
+
+/**
+ * The triple ai controller handles the admin triple AI mode, if enabled.
+ * It is first created when "Toggle AI Triumvirate" triggers it, and it can be referenced from GLOB.triple_ai_controller
+ * After it handles roundstart business, it cleans itself up.
+ */
+/datum/triple_ai_controller
+
+/datum/triple_ai_controller/New()
+	. = ..()
+	RegisterSignal(SSjob, COMSIG_OCCUPATIONS_DIVIDED, PROC_REF(on_occupations_divided))
+
+/datum/triple_ai_controller/proc/on_occupations_divided(datum/source, pure, allow_all)
+	SIGNAL_HANDLER
+
+	for(var/datum/job/ai/ai_datum in SSjob.joinable_occupations)
+		ai_datum.spawn_positions = 3
+	if(!pure)
+		for(var/obj/effect/landmark/start/ai/secondary/secondary_ai_spawn in GLOB.start_landmarks_list)
+			secondary_ai_spawn.latejoin_active = TRUE
+		qdel(src)
+
+/datum/triple_ai_controller/Destroy(force)
+	UnregisterSignal(SSjob, COMSIG_OCCUPATIONS_DIVIDED)
+	GLOB.triple_ai_controller = null
+	. = ..()
+
+/client/proc/triple_ai()
+	set category = "Admin.Events"
+	set name = "Toggle AI Triumvirate"
+
+	if(SSticker.current_state > GAME_STATE_PREGAME)
+		to_chat(usr, "This option is currently only usable during pregame. This may change at a later date.", confidential = TRUE)
+		return
+
+	var/datum/job/job = SSjob.GetJobType(/datum/job/ai)
+	if(!job)
+		to_chat(usr, "Unable to locate the AI job", confidential = TRUE)
+		CRASH("triple_ai() called, no /datum/job/ai to be found.")
+
+	if(!GLOB.triple_ai_controller)
+		GLOB.triple_ai_controller = new()
+	else
+		QDEL_NULL(GLOB.triple_ai_controller)
+	to_chat(usr, "There will[GLOB.triple_ai_controller ? "" : "not"] be an AI Triumvirate at round start.")
+	message_admins(span_adminnotice("[key_name_admin(usr)] has toggled [GLOB.triple_ai_controller ? "on" : "off"] triple AIs at round start."))

code/modules/admin/verbs/secrets.dm

@@ -257,6 +257,11 @@ ADMIN_VERB(secrets, R_NONE, "Secrets", "Abuse harder than you ever have before w
 				return
 			holder.anon_names()
 			SSblackbox.record_feedback("nested tally", "admin_secrets_fun_used", 1, list("Anonymous Names"))
+		if("tripleAI")
+			if(!is_funmin)
+				return
+			holder.triple_ai()
+			SSblackbox.record_feedback("nested tally", "admin_secrets_fun_used", 1, list("Triple AI"))
 		if("onlyone")
 			if(!is_funmin)
 				return