Implements dynamic latespawns (#31005)

* first pass

* Latespawning now works for implied rulesets

* Prevent team antags from getting latespawns.

* calculate_budget() formula no longer gives half-points

* fix mindflayer ruleset not updating banned_jobs

* update dynamic budget unit test for new formula

* tweak latespawn budget threshold

* remove autotraitor ruleset

* use the right logging proc this time

* oops

* Logging tweaks. log_dynamic can now output to log_debug.

* Logging tweaks. Don't log crew join/cryo when latespawns are disabled.

* Fix rare double antag spawn with implied ruleset trigger.

* add heretic ruleset

* prevent dynamic antag_budget from going negative.

* implement add/remove_owner_to_gamemode() for changeling datum

code/modules/antagonists/changeling/datum_changeling.dm

@@ -60,7 +60,6 @@ RESTRICT_TYPE(/datum/antagonist/changeling)
 		purchaseable_powers = get_powers_of_type(CHANGELING_PURCHASABLE_POWER)
 
 /datum/antagonist/changeling/on_gain()
-	SSticker.mode.changelings |= owner
 	var/honorific = owner.current.gender == FEMALE ? "Ms." : "Mr."
 	if(length(GLOB.possible_changeling_IDs))
 		changelingID = pick(GLOB.possible_changeling_IDs)
@@ -79,12 +78,17 @@ RESTRICT_TYPE(/datum/antagonist/changeling)
 	..()
 
 /datum/antagonist/changeling/Destroy()
-	SSticker.mode.changelings -= owner
 	QDEL_LIST_CONTENTS(acquired_powers)
 	STOP_PROCESSING(SSobj, src)
 	chosen_sting = null
 	return ..()
 
+/datum/antagonist/changeling/add_owner_to_gamemode()
+	SSticker.mode.changelings |= owner
+
+/datum/antagonist/changeling/remove_owner_from_gamemode()
+	SSticker.mode.changelings -= owner
+
 /datum/antagonist/changeling/greet()
 	. = ..()
 	SEND_SOUND(owner.current, sound('sound/ambience/antag/ling_alert.ogg'))