Ports elements: Lightweight shared/global components.

code/controllers/subsystem/dcs.dm

@@ -1,6 +1,15 @@
-SUBSYSTEM_DEF(dcs)
+PROCESSING_SUBSYSTEM_DEF(dcs)
 	name = "Datum Component System"
-	flags = SS_NO_INIT | SS_NO_FIRE
+	flags = SS_NO_INIT
+	var/list/elements_by_type = list()
 
-/datum/controller/subsystem/dcs/Recover()
+/datum/controller/subsystem/processing/dcs/Recover()
 	comp_lookup = SSdcs.comp_lookup
+
+/datum/controller/subsystem/processing/dcs/proc/GetElement(eletype)
+	. = elements_by_type[eletype]
+	if(.)
+		return
+	if(!ispath(eletype, /datum/element))
+		CRASH("Attempted to instantiate [eletype] as a /datum/element")
+	. = elements_by_type[eletype] = new eletype