expand simple_animals/hostile/aistatus into a simple_animals-wide system for putting mobs into idling mode (#31778)

* Initial commit

* Time is a circus

* Send in the clowns

* i broke something

* Revert "i broke something"

This reverts commit 5a29c40d131b39effe9ebcb6c8c1883693baf07f.

* I think it works?

* cleanup

* define reminders

* Fixes tendrils and such

* sentience_act now moves the mob to AI_OFF state

code/controllers/subsystem/idlenpcpool.dm

@@ -0,0 +1,34 @@
+SUBSYSTEM_DEF(idlenpcpool)
+	name = "Idling NPC Pool"
+	flags = SS_POST_FIRE_TIMING|SS_NO_INIT|SS_BACKGROUND
+	priority = 10
+	wait = 60
+	runlevels = RUNLEVEL_GAME | RUNLEVEL_POSTGAME
+
+	var/list/currentrun = list()
+
+/datum/controller/subsystem/idlenpcpool/stat_entry()
+	var/list/idlelist = GLOB.simple_animals[AI_IDLE]
+	..("IdleNPCS:[idlelist.len]")
+
+/datum/controller/subsystem/idlenpcpool/fire(resumed = FALSE)
+
+	if (!resumed)
+		var/list/idlelist = GLOB.simple_animals[AI_IDLE]
+		src.currentrun = idlelist.Copy()
+
+	//cache for sanic speed (lists are references anyways)
+	var/list/currentrun = src.currentrun
+
+
+	while(currentrun.len)
+		var/mob/living/simple_animal/SA = currentrun[currentrun.len]
+		--currentrun.len
+
+		if(!SA.ckey)
+			if(SA.stat != DEAD)
+				SA.handle_automated_movement()
+			if(SA.stat != DEAD)
+				SA.consider_wakeup()
+		if (MC_TICK_CHECK)
+			return

code/controllers/subsystem/npcpool.dm

@@ -37,7 +37,8 @@ SUBSYSTEM_DEF(npcpool)
 	// 5. Do all assignments: goes through the delegated/coordianted bots and assigns the right variables/tasks to them.
 
 	if (!resumed)
-		src.currentrun = GLOB.simple_animals.Copy()
+		var/list/activelist = GLOB.simple_animals[AI_ON]
+		src.currentrun = activelist.Copy()
 		stage = PROCESSING_SIMPLES
 	//cache for sanic speed (lists are references anyways)
 	var/list/currentrun = src.currentrun