Merge pull request #10005 from PsiOmegaDelta/150703-Uplinkery

Uplink Items - Part III

code/_helpers/lists.dm

@@ -604,10 +604,13 @@ datum/proc/dd_SortValue()
 /datum/alarm/dd_SortValue()
 	return "[sanitize_old(last_name)]"
 
+/proc/subtypes(prototype)
+	return (typesof(prototype) - prototype)
+
 //creates every subtype of prototype (excluding prototype) and adds it to list L.
 //if no list/L is provided, one is created.
 /proc/init_subtypes(prototype, list/L)
 	if(!istype(L))	L = list()
-	for(var/path in (typesof(prototype) - prototype))
+	for(var/path in subtypes(prototype))
 		L += new path()
 	return L