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/controllers/subsystems/materials.dm

@@ -3,30 +3,25 @@ SUBSYSTEM_DEF(materials)
 	init_order = INIT_ORDER_MISC_FIRST
 	flags = SS_NO_FIRE
 
-	var/list/materials
 	var/list/materials_by_name
 
-	var/list/autolathe_categories
-
 /datum/controller/subsystem/materials/Initialize()
-	create_material_lists()
+	create_material_names_list()
 
 	return SS_INIT_SUCCESS
 
 /**
  * Initialize the lists of materials, if they are not initialized already
  */
-/datum/controller/subsystem/materials/proc/create_material_lists()
-	if(LAZYLEN(materials))
+/datum/controller/subsystem/materials/proc/create_material_names_list()
+	if(LAZYLEN(materials_by_name))
 		return
 
-	materials = list()
 	materials_by_name = list()
 
-	for(var/M in subtypesof(/material))
-		var/material/material = new M
+	for(var/M in subtypesof(/singleton/material))
+		var/singleton/material/material = new M
 		if(material.name)
-			materials += material
 			materials_by_name[lowertext(material.name)] = material
 
 /**
@@ -36,7 +31,7 @@ SUBSYSTEM_DEF(materials)
  */
 /datum/controller/subsystem/materials/proc/get_material_by_name(var/material_name)
 	if(!materials_by_name)
-		create_material_lists()
+		create_material_names_list()
 	. = materials_by_name[material_name]
 	if(!.)
 		stack_trace("SSmaterials received a request for a material that was not found: [material_name].")
@@ -47,6 +42,6 @@ SUBSYSTEM_DEF(materials)
  * * material_name - A string, lowercase, representing the display name of the material
  */
 /datum/controller/subsystem/materials/proc/material_display_name(var/material_name)
-	var/material/material = get_material_by_name(material_name)
+	var/singleton/material/material = get_material_by_name(material_name)
 	if(material)
-		return material.display_name
+		return material