Materials Repath (#22388)

Soft-ish port of https://github.com/NebulaSS13/Nebula/pull/540. Except
we call them singletons.

Repaths all materials as singletons instead of datums, and replaces
material defines from strings to paths so that we can just run
GET_SINGLETON instead of needing to use SSMaterials. This is Step One.

This PR has no player-facing changes.

changes:
  - refactor: "Repaths /material to /singleton/material."
- refactor: "Replaces all material string defines to path defines,
replacing SSmaterials procs w/ GET_SINGLETON instead."
- refactor: "Removes all material var edited objects from all maps,
adding new presets where necessary."
- refactor: "Updates recipes unit test to run all recipes against all
material singletons."

---------

Signed-off-by: Batrachophreno <Batrochophreno@gmail.com>
Co-authored-by: kano-dot <bhutanlikanoxy@gmail.com>

code/game/objects/items/stacks/sheets/glass.dm

@@ -18,7 +18,7 @@
 	var/created_window = /obj/structure/window/basic
 	var/is_reinforced = 0
 	var/list/construction_options = list("One Direction", "Full Window")
-	default_type = "glass"
+	default_type = MATERIAL_GLASS
 	icon_has_variants = TRUE
 	drop_sound = 'sound/items/drop/glass_sheet.ogg'
 	pickup_sound = 'sound/items/pickup/glass_sheet.ogg'
@@ -112,7 +112,7 @@
 	name = "reinforced glass"
 	singular_name = "reinforced glass sheet"
 	icon_state = "sheet-rglass"
-	default_type = "reinforced glass"
+	default_type = MATERIAL_GLASS_REINFORCED
 	created_window = /obj/structure/window/reinforced
 	is_reinforced = 1
 	construction_options = list("One Direction", "Full Window", "Windoor")
@@ -127,7 +127,7 @@
 	icon = 'icons/obj/item/stacks/tiles.dmi'
 	icon_state = "glass_wire"
 	created_window = null
-	default_type = "wired glass"
+	default_type = MATERIAL_GLASS_WIRED
 	construction_options = list()
 	icon_has_variants = FALSE
 
@@ -160,7 +160,7 @@
 	singular_name = "phoron glass sheet"
 	icon_state = "sheet-phoronglass"
 	created_window = /obj/structure/window/borosilicate
-	default_type = "phoron glass"
+	default_type = MATERIAL_GLASS_PHORON
 	icon_has_variants = FALSE
 
 /*
@@ -170,7 +170,7 @@
 	name = "reinforced phoron glass"
 	singular_name = "reinforced phoron glass sheet"
 	icon_state = "sheet-phoronrglass"
-	default_type = "reinforced phoron glass"
+	default_type = MATERIAL_GLASS_REINFORCED_PHORON
 	created_window = /obj/structure/window/borosilicate/reinforced
 	is_reinforced = 1
 	icon_has_variants = FALSE

code/game/objects/items/stacks/sheets/leather.dm

@@ -19,14 +19,14 @@
 	name = "human skin"
 	desc = "The by-product of human farming."
 	singular_name = "human skin piece"
-	default_type = "human hide"
+	default_type = MATERIAL_HIDE_HUMAN
 
 /obj/item/stack/material/animalhide/corgi
 	name = "corgi hide"
 	desc = "The by-product of corgi farming."
 	singular_name = "corgi hide piece"
 	icon_state = "sheet-corgi"
-	default_type = "corgi hide"
+	default_type = MATERIAL_HIDE_CORGI
 	icon_has_variants = FALSE
 
 /obj/item/stack/material/animalhide/cat
@@ -34,7 +34,7 @@
 	desc = "The by-product of cat farming."
 	icon_state = "sheet-cat"
 	singular_name = "cat hide piece"
-	default_type = "cat hide"
+	default_type = MATERIAL_HIDE_CAT
 	icon_has_variants = FALSE
 
 /obj/item/stack/material/animalhide/monkey
@@ -42,7 +42,7 @@
 	desc = "The by-product of monkey farming."
 	singular_name = "monkey hide piece"
 	icon_state = "sheet-monkey"
-	default_type = "monkey hide"
+	default_type = MATERIAL_HIDE_MONKEY
 	icon_has_variants = FALSE
 
 /obj/item/stack/material/animalhide/lizard
@@ -50,7 +50,7 @@
 	desc = "Sssssss..."
 	singular_name = "lizard skin piece"
 	icon_state = "sheet-lizard"
-	default_type = "lizard hide"
+	default_type = MATERIAL_HIDE_LIZARD
 	icon_has_variants = FALSE
 	hide_type = "scales"
 
@@ -59,7 +59,7 @@
 	desc = "A hide without fur or scales. Can be tanned into leather."
 	singular_name = "bare hide piece"
 	icon_state = "sheet-hairlesshide"
-	default_type = "bare hide"
+	default_type = MATERIAL_HIDE_BARE
 	bare = TRUE
 
 /obj/item/stack/material/animalhide/barehide/mechanics_hints(mob/user, distance, is_adjacent)
@@ -71,7 +71,7 @@
 	desc = "This leather has been cleaned but still needs to be dried."
 	singular_name = "wet leather piece"
 	icon_state = "sheet-wetleather"
-	default_type = "wet leather"
+	default_type = MATERIAL_WET_LEATHER
 	icon_has_variants = TRUE
 	bare = TRUE
 	var/wetness = 30 //Reduced when exposed to high temperautres or manually dried with a welding tool.