Refactors sound groups to use decls instead of a massive switch with dozens of global lists. (#9702)

code/modules/materials/materials.dm

@@ -104,9 +104,9 @@
 	//for use in material weapons. because tiles and stacks sound different. since cardboard baseball bats sound different from wooden ones and et cetera.
 	var/weapon_drop_sound = 'sound/items/drop/metalweapon.ogg'
 	var/weapon_pickup_sound = 'sound/items/pickup/metalweapon.ogg'
-	var/weapon_hitsound = "swing_hit"
+	var/weapon_hitsound = /decl/sound_category/swing_hit_sound
 
-	var/shatter_sound = "glass_break" //sound it makes when it breaks.
+	var/shatter_sound = /decl/sound_category/glass_break_sound //sound it makes when it breaks.
 
 /material/proc/build_rod_product(var/mob/user, var/obj/item/stack/used_stack, var/obj/item/stack/target_stack)
 	if(!rod_product)
@@ -701,7 +701,7 @@
 	dooropen_noise = 'sound/effects/doorcreaky.ogg'
 	door_icon_base = "wood"
 	destruction_desc = "splinters"
-	shatter_sound = "shatter_wood"
+	shatter_sound = /decl/sound_category/wood_break_sound
 	sheet_singular_name = "plank"
 	sheet_plural_name = "planks"
 	golem = SPECIES_GOLEM_WOOD
@@ -711,7 +711,7 @@
 	weapon_drop_sound = 'sound/items/drop/woodweapon.ogg'
 	weapon_pickup_sound = 'sound/items/pickup/woodweapon.ogg'
 	weapon_hitsound = 'sound/weapons/woodenhit.ogg'
-	shatter_sound = "wood_break"
+	shatter_sound = /decl/sound_category/wood_break_sound
 
 /material/wood/log //This is gonna replace wood planks in a  way for NBT, leaving it here for now
 	name = MATERIAL_WOOD_LOG
@@ -777,12 +777,11 @@
 	stack_origin_tech = list(TECH_MATERIAL = 1)
 	door_icon_base = "wood"
 	destruction_desc = "crumples"
-	shatter_sound = "shatter_cardboard"
+	shatter_sound = /decl/sound_category/cardboard_break_sound
 	golem = SPECIES_GOLEM_CARDBOARD
 	drop_sound = 'sound/items/drop/cardboardbox.ogg'
 	pickup_sound = 'sound/items/pickup/cardboardbox.ogg'
 	weapon_hitsound = 'sound/weapons/cardboardhit.ogg'
-	shatter_sound = "cardboard_break"
 
 /material/cult
 	name = MATERIAL_CULT