Agent ID Buff (#8918)

The agent ID card now makes you invisible to the AI when electronic warfare is enabled.
    The price of the agent ID card have been upped to 4, from 3.
    Agent IDs now have a charge, which lasts for a few minutes. When the charge runs out, electronic warfare is disabled.

Credits to Loaf (the man of many names) from Nebula for teaching me this technique.

code/controllers/subsystems/ai_obfuscation.dm

@@ -0,0 +1,33 @@
+var/global/datum/controller/subsystem/ai_obfuscation/SSai_obfuscation
+
+/datum/controller/subsystem/ai_obfuscation
+	name = "AI Obfuscation"
+	flags = SS_NO_FIRE
+
+	var/list/image/obfuscation_images = list()
+
+/datum/controller/subsystem/ai_obfuscation/New()
+	NEW_SS_GLOBAL(SSai_obfuscation)
+
+/datum/controller/subsystem/ai_obfuscation/proc/add_obfuscation_image(var/image/added_image)
+	if(!istype(added_image))
+		return
+	obfuscation_images += added_image
+
+	for(var/ai in ai_list)
+		var/mob/living/silicon/ai/A = ai
+		if(A.client)
+			A.client.images += added_image
+
+/datum/controller/subsystem/ai_obfuscation/proc/remove_obfuscation_image(var/image/removed_image)
+	if(!istype(removed_image))
+		return
+	obfuscation_images -= removed_image
+
+	for(var/ai in ai_list)
+		var/mob/living/silicon/ai/A = ai
+		if(A.client)
+			A.client.images -= removed_image
+
+/datum/controller/subsystem/ai_obfuscation/proc/get_obfuscation_images()
+	return obfuscation_images