Renames most processing SS' to the convention of SS[SS name here] (#25302)

* Renames most processing SS'

* Contra review

code/controllers/subsystem/processing/SSprocessing.dm

@@ -0,0 +1,42 @@
+//Used to process objects. Fires once every second.
+
+SUBSYSTEM_DEF(processing)
+	name = "Processing"
+	priority = FIRE_PRIORITY_PROCESS
+	flags = SS_BACKGROUND|SS_POST_FIRE_TIMING|SS_NO_INIT
+	wait = 10
+
+	var/stat_tag = "P" //Used for logging
+	var/list/processing = list()
+	var/list/currentrun = list()
+	offline_implications = "Objects using the default processor will no longer process. Shuttle call recommended."
+
+/datum/controller/subsystem/processing/get_stat_details()
+	return "[stat_tag]:[length(processing)]"
+
+/datum/controller/subsystem/processing/get_metrics()
+	. = ..()
+	var/list/cust = list()
+	cust["processing"] = length(processing)
+	.["custom"] = cust
+
+/datum/controller/subsystem/processing/fire(resumed = 0)
+	if(!resumed)
+		currentrun = processing.Copy()
+	//cache for sanic speed (lists are references anyways)
+	var/list/current_run = currentrun
+
+	while(length(current_run))
+		var/datum/thing = current_run[length(current_run)]
+		current_run.len--
+		if(QDELETED(thing))
+			processing -= thing
+		else if(thing.process(wait) == PROCESS_KILL)
+			// fully stop so that a future START_PROCESSING will work
+			STOP_PROCESSING(src, thing)
+		if(MC_TICK_CHECK)
+			return
+
+/datum/proc/process()
+	set waitfor = 0
+	return PROCESS_KILL