[READY] Bespoke Datum Mats (#55296)

* Bespoke Material Backend

- Adds support for bespoke materials:
  - Reimplements [/datum/material/var/id]
  - Ports GetIdFromArguments from SSdcs
  - Adds a wrapper define for GetMaterialRef
  - Adds [MATERIAL_INIT_BESPOKE]
  - Adds [/datum/material/proc/Initialize]
- Does not actually add any bespoke materials

- [ ] TODO: Code docs
- [ ] TODO: Actually adding bespoke materials

* Some has_material procs and cleaning up some spaghetti

- Adds a pair of has_material procs for use in checking whether a given atom has a given material

* Adds meat

- Adds bespoke meat variants
  - Does not make them accessible
- Shuts up the linter

* Implements bespoke meat

- Makes the material container preserve bespoke materials
- Makes the sheetifier accept bespoke materials
- Makes the autolathe accept bespoke materials
- Makes the gibber produce bespoke meats

* Makes butchering produce bespoke meats

This is jank and really needs to be folded into a unified butchering and gibbing system

* Material documentation

- Adds, fixes, and touches up some documentation

* Material container insertion callback

- Changes the proc used to expand the material container's material list ot a proc used to check whether a material fits into a material container
- Instantiating new materials is no longer O(n) relative to the number of autolathes in existence.

* Makes processing meat conserve materials

- Makes bespoke meat carry over into meatballs

* Makes preserving custom materials an option

- Implements the ability to turn preserving custom materials _off_ for processor recipes

* Fixes all bespoke materials of the same type using the same singleton

- We use ids now, not just types.

* Makes the fat sucker produce bespoke meats

- Because consistency is good.

* Fixes autolathes merging bespoke stacks into normal stacks.

* Makes the callback to test materials for holdibility optional

- @Floyd

* GetMaterialRef -> GET_MATERIAL_REF

- We capitalize macros.

* Removes an extraneous callback

- Makes the sheetifier use functionality I didn't notice I implemented a few commits ago.

* Makes mob and species meat null compatible

* Fixes the ore silo

- The ore silo had really snowflake material handling that has been brought in line with the rest.
- The materials should show up in the correct order.

* Fixes minor lathe bugs

- Fixes stack_traces caused when lathes tried to fetch materials using reagent typepaths
- Fixed the selective reagent disposal topic. I have no idea how long this has been broken.

* Various documentation fixes

- Clarified a couple comments
- Removes an extraneous ?. operator
- Fixed mat floor tiles having bugged reagent temperatures

* More fixes

-/datum/material/meat/mob -> /datum/material/meat/mob_meat
- Adds atom typecheck to material containers.

* Fixes old typepaths

code/game/objects/items/stacks/stack.dm

@@ -40,7 +40,7 @@
 	/// Amount of matter for RCD
 	var/matter_amount = 0
 
-/obj/item/stack/Initialize(mapload, new_amount, merge = TRUE)
+/obj/item/stack/Initialize(mapload, new_amount, merge = TRUE, list/mat_override=null, mat_amt=1)
 	if(new_amount != null)
 		amount = new_amount
 	while(amount > max_amount)
@@ -49,7 +49,9 @@
 	if(!merge_type)
 		merge_type = type
 
-	if(LAZYLEN(mats_per_unit))
+	if(LAZYLEN(mat_override))
+		set_mats_per_unit(mat_override, mat_amt)
+	else if(LAZYLEN(mats_per_unit))
 		set_mats_per_unit(mats_per_unit, 1)
 	else if(LAZYLEN(custom_materials))
 		set_mats_per_unit(custom_materials, amount ? 1/amount : 1)
@@ -62,7 +64,7 @@
 	var/list/temp_recipes = get_main_recipes()
 	recipes = temp_recipes.Copy()
 	if(material_type)
-		var/datum/material/M = SSmaterials.GetMaterialRef(material_type) //First/main material
+		var/datum/material/M = GET_MATERIAL_REF(material_type) //First/main material
 		for(var/i in M.categories)
 			switch(i)
 				if(MAT_CATEGORY_BASE_RECIPES)
@@ -477,9 +479,8 @@
 /obj/item/stack/proc/split_stack(mob/user, amount)
 	if(!use(amount, TRUE, FALSE))
 		return null
-	var/obj/item/stack/F = new type(user? user : drop_location(), amount, FALSE)
+	var/obj/item/stack/F = new type(user? user : drop_location(), amount, FALSE, mats_per_unit)
 	. = F
-	F.set_mats_per_unit(mats_per_unit, 1) // Required for greyscale sheets and tiles.
 	F.copy_evidences(src)
 	if(user)
 		if(!user.put_in_hands(F, merge_stacks = FALSE))