Refactored the abstract meta propriety (#19797)

Refactored the abstract meta propriety into defines.
It's now more easy to spot/see abstract types thanks to the macro that
defines them.
Added a check on initialization of atoms to avoid spawning abstract
types.
Made the spawn_atom proc check for abstractness.
Made the spawn_atom proc use tgui_list for types list shorter than 1000
elements, which enables to search in them. It's too laggy on larger
lists so above 1000 it uses the builtin input.
Made the spawn_atom use a list subtraction instead of a double list,
it's lighter on memory and processing.

code/modules/client/preference_setup/loadout/items/accessories.dm

@@ -1,5 +1,4 @@
-/datum/gear/accessory
-	abstract_type = /datum/gear/accessory
+ABSTRACT_TYPE(/datum/gear/accessory)
 	sort_category = "Accessories"
 
 /datum/gear/accessory/locket

code/modules/client/preference_setup/loadout/items/computer.dm

@@ -4,8 +4,7 @@
 	sort_category = "Modular Computers"
 	cost = 2
 
-/datum/gear/computer/handheld
-	abstract_type = /datum/gear/computer/handheld
+ABSTRACT_TYPE(/datum/gear/computer/handheld)
 
 /datum/gear/computer/handheld/tablet
 	display_name = "tablet"
@@ -26,8 +25,7 @@
 	tablets["machinist tablet"] = /obj/item/modular_computer/handheld/preset/supply/machinist
 	gear_tweaks += new /datum/gear_tweak/path(tablets)
 
-/datum/gear/computer/handheld/wristbound
-	abstract_type = /datum/gear/computer/handheld/wristbound
+ABSTRACT_TYPE(/datum/gear/computer/handheld/wristbound)
 
 /datum/gear/computer/handheld/wristbound/selection
 	display_name = "wristbound computer selection"

code/modules/client/preference_setup/loadout/items/religion.dm

@@ -1,10 +1,8 @@
-/datum/gear/religion
-	abstract_type = /datum/gear/religion
+ABSTRACT_TYPE(/datum/gear/religion)
 	sort_category = "Religion"
 	flags = GEAR_HAS_DESC_SELECTION
 
-/datum/gear/religion/trinary
-	abstract_type = /datum/gear/religion/trinary
+ABSTRACT_TYPE(/datum/gear/religion/trinary)
 	religion = RELIGION_TRINARY
 
 /datum/gear/religion/trinary/mask
@@ -105,8 +103,7 @@
 	slot = slot_tie
 	flags = GEAR_HAS_DESC_SELECTION | GEAR_HAS_COLOR_SELECTION
 
-/datum/gear/religion/dominia
-	abstract_type = /datum/gear/religion/dominia
+ABSTRACT_TYPE(/datum/gear/religion/dominia)
 	religion = RELIGION_MOROZ
 
 /datum/gear/religion/dominia/robe
@@ -219,8 +216,7 @@
 	dominiaicon["icon of the martyr, valeria"] = /obj/item/sign/painting_frame/martyr/valeria
 	gear_tweaks += new /datum/gear_tweak/path(dominiaicon)
 
-/datum/gear/religion/assunzione
-	abstract_type = /datum/gear/religion/assunzione
+ABSTRACT_TYPE(/datum/gear/religion/assunzione)
 	religion = RELIGION_LUCEISM
 
 /datum/gear/religion/assunzione/scripture

code/modules/client/preference_setup/loadout/items/suit.dm

@@ -380,8 +380,7 @@
 	jacket["departmental jacket, service"] = /obj/item/clothing/suit/storage/toggle/serv_dep_jacket
 	gear_tweaks += new /datum/gear_tweak/path(jacket)
 
-/datum/gear/suit/miscellaneous
-	abstract_type = /datum/gear/suit/miscellaneous
+ABSTRACT_TYPE(/datum/gear/suit/miscellaneous)
 
 /datum/gear/suit/miscellaneous/peacoat
 	display_name = "peacoat"

code/modules/client/preference_setup/loadout/items/xeno/diona.dm

@@ -8,8 +8,7 @@
 	flags = GEAR_NO_SELECTION
 	culture_restriction = list(/singleton/origin_item/culture/diona_sol)
 
-/datum/gear/suit/diona
-	abstract_type = /datum/gear/suit/diona
+ABSTRACT_TYPE(/datum/gear/suit/diona)
 
 /datum/gear/suit/diona/eternal
 	display_name = "mesh weave robes"
@@ -128,8 +127,7 @@
 	sort_category = "Xenowear - Diona"
 	culture_restriction = list(/singleton/origin_item/culture/dionae_nralakk, /singleton/origin_item/culture/xrim)
 
-/datum/gear/accessory/diona
-	abstract_type = /datum/gear/accessory/diona
+ABSTRACT_TYPE(/datum/gear/accessory/diona)
 
 /datum/gear/accessory/diona/skrell_passport
 	display_name = "dionae nralakk federation passport"

code/modules/client/preference_setup/loadout/items/xeno/machine.dm

@@ -140,8 +140,7 @@
 	goldendeep["golden deep skirtsuit"] = /obj/item/clothing/under/goldendeep/skirtsuit
 	gear_tweaks += new /datum/gear_tweak/path(goldendeep)
 
-/datum/gear/augment/machine
-	abstract_type = /datum/gear/augment/machine
+ABSTRACT_TYPE(/datum/gear/augment/machine)
 
 /datum/gear/augment/machine/gustatorial
 	display_name = "gustatorial centre (tongue)"

code/modules/client/preference_setup/loadout/items/xeno/skrell.dm

@@ -1,5 +1,4 @@
-/datum/gear/ears/skrell
-	abstract_type = /datum/gear/ears/skrell
+ABSTRACT_TYPE(/datum/gear/ears/skrell)
 
 /datum/gear/ears/skrell/chains	//Chains
 	display_name = "headtail chain selection"
@@ -298,8 +297,7 @@ var/datum/gear_tweak/social_credit/social_credit_tweak = new()
 	outfit["iqi medical"] = /obj/item/clothing/under/skrell/nralakk/iqi/med
 	gear_tweaks += new /datum/gear_tweak/path(outfit)
 
-/datum/gear/suit/skrell
-	abstract_type = /datum/gear/suit/skrell
+ABSTRACT_TYPE(/datum/gear/suit/skrell)
 
 /datum/gear/suit/skrell/jacket
 	display_name = "work jackets"
@@ -333,8 +331,8 @@ var/datum/gear_tweak/social_credit/social_credit_tweak = new()
 	jacket["iqi medical"] = /obj/item/clothing/suit/storage/toggle/skrell/iqi/med
 	gear_tweaks += new /datum/gear_tweak/path(jacket)
 
-/datum/gear/accessory/skrell
-	abstract_type = /datum/gear/accessory/skrell
+ABSTRACT_TYPE(/datum/gear/accessory/skrell)
+
 /datum/gear/accessory/skrell/starcoat
 	display_name = "star coat"
 	path = /obj/item/clothing/suit/storage/toggle/skrell/starcoat

code/modules/client/preference_setup/loadout/items/xeno/tajara.dm

@@ -1,5 +1,4 @@
-/datum/gear/shoes/tajara
-	abstract_type = /datum/gear/shoes/tajara
+ABSTRACT_TYPE(/datum/gear/shoes/tajara)
 
 /datum/gear/shoes/tajara/boots
 	display_name = "tajaran boots selection"

code/modules/client/preference_setup/loadout/items/xeno/vaurca.dm

@@ -232,8 +232,7 @@
 	whitelisted = list(SPECIES_VAURCA_WORKER, SPECIES_VAURCA_WARRIOR, SPECIES_VAURCA_BREEDER, SPECIES_VAURCA_BULWARK)
 	flags = GEAR_NO_SELECTION
 
-/datum/gear/ears/vaurca
-	abstract_type = /datum/gear/ears/vaurca
+ABSTRACT_TYPE(/datum/gear/ears/vaurca)
 
 /datum/gear/ears/vaurca/rings
 	display_name = "bulwark horn rings"