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/modules/research/xenoarchaeology/finds/finds_special.dm

@@ -65,13 +65,13 @@
 	///Amount of force required by the weapon to smash the statue.
 	var/fragile = 15
 	///Sets the type of material for use by the place shard proc.
-	var/material/shatter_material = MATERIAL_STEEL
+	var/singleton/material/shatter_material = MATERIAL_STEEL
 
 /obj/item/vampiric/New()
 	..()
 	START_PROCESSING(SSprocessing, src)
 	become_hearing_sensitive()
-	shatter_material = SSmaterials.get_material_by_name(shatter_material)
+	shatter_material = GET_SINGLETON(shatter_material)
 
 /obj/item/vampiric/Destroy()
 	STOP_PROCESSING(SSprocessing, src)