cleans up holodeck map templates + prevents the holodeck from overloading due to lag (#88792)

## About The Pull Request
removes unused holodeck template vars
prevents the holodeck from overloading if process is fired during
loading

## Why It's Good For The Game
unused var bad
holodeck shouldnt detonate if the server lags

## Changelog
🆑
fix: holodeck no longer explodes if the server lags while its loading a
new sim
/🆑

code/modules/holodeck/computer.dm

@@ -365,6 +365,8 @@ GLOBAL_LIST_INIT(typecache_holodeck_linked_floorcheck_ok, typecacheof(list(/turf
 			if(SPT_PROB(2.5, seconds_per_tick))
 				do_sparks(2, 1, holo_turf)
 				return
+	if(spawning_simulation)
+		return // putting it here because updating power would be pointless we are only loading it
 	. = ..()
 	if(!. || program == offline_program)//we dont need to scan the holodeck if the holodeck is offline
 		update_use_power(IDLE_POWER_USE)

code/modules/holodeck/holodeck_map_templates.dm

@@ -1,134 +1,112 @@
 
 /datum/map_template/holodeck
+	/// id
 	var/template_id
-	var/description
+	/// Is this an emag program
 	var/restricted = FALSE
-	var/datum/parsed_map/lastparsed
 
 	should_place_on_top = FALSE
 	returns_created_atoms = TRUE
 	keep_cached_map = TRUE
 
-	var/obj/machinery/computer/holodeck/linked
-
 /datum/map_template/holodeck/offline
 	name = "Holodeck - Offline"
 	template_id = "holodeck_offline"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_offline.dmm"
 
 /datum/map_template/holodeck/emptycourt
 	name = "Holodeck - Empty Court"
 	template_id = "holodeck_emptycourt"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_emptycourt.dmm"
 
 /datum/map_template/holodeck/dodgeball
 	name = "Holodeck - Dodgeball Court"
 	template_id = "holodeck_dodgeball"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_dodgeball.dmm"
 
 /datum/map_template/holodeck/basketball
 	name = "Holodeck - Basketball Court"
 	template_id = "holodeck_basketball"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_basketball.dmm"
 
 /datum/map_template/holodeck/thunderdome
 	name = "Holodeck - Thunderdome Arena"
 	template_id = "holodeck_thunderdome"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_thunderdome.dmm"
 
 /datum/map_template/holodeck/beach
 	name = "Holodeck - Beach"
 	template_id = "holodeck_beach"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_beach.dmm"
 
 /datum/map_template/holodeck/lounge
 	name = "Holodeck - Lounge"
 	template_id = "holodeck_lounge"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_lounge.dmm"
 
 /datum/map_template/holodeck/petpark
 	name = "Holodeck - Pet Park"
 	template_id = "holodeck_petpark"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_petpark.dmm"
 
 /datum/map_template/holodeck/firingrange
 	name = "Holodeck - Firing Range"
 	template_id = "holodeck_firingrange"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_firingrange.dmm"
 
 /datum/map_template/holodeck/anime_school
 	name = "Holodeck - Anime School"
 	template_id = "holodeck_animeschool"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_animeschool.dmm"
 
 /datum/map_template/holodeck/chapelcourt
 	name = "Holodeck - Chapel Courtroom"
 	template_id = "holodeck_chapelcourt"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_chapelcourt.dmm"
 
 /datum/map_template/holodeck/spacechess
 	name = "Holodeck - Space Chess"
 	template_id = "holodeck_spacechess"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_spacechess.dmm"
 
 /datum/map_template/holodeck/spacecheckers
 	name = "Holodeck - Space Checkers"
 	template_id = "holodeck_spacecheckers"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_spacecheckers.dmm"
 
 /datum/map_template/holodeck/kobayashi
 	name = "Holodeck - Kobayashi Maru"
 	template_id = "holodeck_kobayashi"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_kobayashi.dmm"
 
 /datum/map_template/holodeck/winterwonderland
 	name = "Holodeck - Winter Wonderland"
 	template_id = "holodeck_winterwonderland"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_winterwonderland.dmm"
 
 /datum/map_template/holodeck/photobooth
 	name = "Holodeck - Photobooth"
 	template_id = "holodeck_photobooth"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_photobooth.dmm"
 
 /datum/map_template/holodeck/skatepark
 	name = "Holodeck - Skatepark"
 	template_id = "holodeck_skatepark"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_skatepark.dmm"
 
 /datum/map_template/holodeck/microwave
 	name = "Holodeck - Microwave Paradise"
 	template_id = "holodeck_microwave"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_microwave.dmm"
 
 /datum/map_template/holodeck/baseball
 	name = "Holodeck - Baseball Field"
 	template_id = "holodeck_baseball"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_baseball.dmm"
 
 /datum/map_template/holodeck/card_battle
 	name = "Holodeck - TGC Battle Arena"
 	template_id = "holodeck_card_battle"
-	description = "An arena for playing Tactical Game Cards."
 	mappath = "_maps/templates/holodeck_card_battle.dmm"
 
 //bad evil no good programs
@@ -136,48 +114,41 @@
 /datum/map_template/holodeck/medicalsim
 	name = "Holodeck - Emergency Medical"
 	template_id = "holodeck_medicalsim"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_medicalsim.dmm"
 	restricted = TRUE
 
 /datum/map_template/holodeck/thunderdome1218
 	name = "Holodeck - 1218 AD"
 	template_id = "holodeck_thunderdome1218"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_thunderdome1218.dmm"
 	restricted = TRUE
 
 /datum/map_template/holodeck/burntest
 	name = "Holodeck - Atmospheric Burn Test"
 	template_id = "holodeck_burntest"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_burntest.dmm"
 	restricted = TRUE
 
 /datum/map_template/holodeck/wildlifesim
 	name = "Holodeck - Wildlife Simulation"
 	template_id = "holodeck_wildlifesim"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_wildlifesim.dmm"
 	restricted = TRUE
 
 /datum/map_template/holodeck/holdoutbunker
 	name = "Holodeck - Holdout Bunker"
 	template_id = "holodeck_holdoutbunker"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_holdoutbunker.dmm"
 	restricted = TRUE
 
 /datum/map_template/holodeck/anthophillia
 	name = "Holodeck - Anthophillia"
 	template_id = "holodeck_anthophillia"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_anthophillia.dmm"
 	restricted = TRUE
 
 /datum/map_template/holodeck/refuelingstation
 	name = "Holodeck - Refueling Station"
 	template_id = "holodeck_refuelingstation"
-	description = "benis"
 	mappath = "_maps/templates/holodeck_refuelingstation.dmm"
 	restricted = TRUE