Traitors/nukeops can now buy borers

This adds a subtype of borers to the traitor uplink. This version cannot
reproduce and is loyal to the owner who released it.
The borer's objectives are tied to the objectives of their owner and
will greentext together with them.

code/game/gamemodes/objective.dm

@@ -902,4 +902,16 @@ var/global/list/possible_items_special = list()
 	command_staff_only = TRUE
 
 
+//Syndicate borer objective, relies on their owner getting a greentext, no matter if they themselves did anything really.
+/datum/objective/syndi_borer
+	explanation_text = "You are a modified syndicate cortical borer, assist your owner with their objectives."
+	martyr_compatible = 1
 
+/datum/objective/syndi_borer/check_completion()
+	if(target)
+		for(var/datum/objective/objective in target.objectives)
+			if(!objective.check_completion())
+				return 0
+		return 1
+	else
+		return 1 //Not sure if we should greentext if we somehow don't even have an owner.