[MIRROR] Port tg statpanel (#9242)

Co-authored-by: ShadowLarkens <shadowlarkens@gmail.com>
Co-authored-by: Kashargul <KashL@t-online.de>

code/controllers/subsystems/processing/obj_tab_items.dm

@@ -0,0 +1,24 @@
+PROCESSING_SUBSYSTEM_DEF(obj_tab_items)
+	name = "Obj Tab Items"
+	flags = SS_NO_INIT
+	runlevels = RUNLEVEL_LOBBY | RUNLEVELS_DEFAULT
+	wait = 0.1 SECONDS
+
+// I know this is mostly copypasta, but I want to change the processing logic
+// Sorry bestie :(
+/datum/controller/subsystem/processing/obj_tab_items/fire(resumed = FALSE)
+	if (!resumed)
+		currentrun = processing.Copy()
+	//cache for sanic speed (lists are references anyways)
+	var/list/current_run = currentrun
+
+	while(current_run.len)
+		var/datum/thing = current_run[current_run.len]
+		if(QDELETED(thing))
+			processing -= thing
+		else if(thing.process(wait * 0.1) == PROCESS_KILL)
+			// fully stop so that a future START_PROCESSING will work
+			STOP_PROCESSING(src, thing)
+		if (MC_TICK_CHECK)
+			return
+		current_run.len--