Merge pull request #351 from jjpark-kb/posialertsystem

adds the positronic alert system

code/game/machinery/posi_alert.dm

@@ -0,0 +1,44 @@
+/obj/machinery/posialert
+	name = "automated positronic alert console"
+	desc = "A console that will ping when a positronic personality is available for download."
+	icon = 'icons/obj/machines/terminals.dmi'
+	icon_state = "posialert"
+	var/inuse = FALSE
+	var/online = TRUE
+
+	var/obj/item/radio/radio
+	var/radio_key = /obj/item/encryptionkey/headset_sci
+	var/science_channel = "Science"
+
+/obj/machinery/posialert/Initialize()
+	. = ..()
+	radio = new(src)
+	radio.keyslot = new radio_key
+	radio.listening = 0
+	radio.recalculateChannels()
+
+/obj/machinery/posialert/Destroy()
+	QDEL_NULL(radio)
+	return ..()
+	
+
+/obj/machinery/posialert/attack_hand(mob/living/user)
+	online = !online
+	to_chat(user, "<span class='warning'>You turn the posi-alert system [online ? "on" : "off"]!</span>")
+	return
+
+/obj/machinery/posialert/attack_ghost(mob/user)
+	. = ..()
+	if(!online)
+		return
+	if(inuse)
+		return
+	inuse = TRUE
+	flick("posialertflash",src)
+	visible_message("There are positronic personalities available!", runechat_popup = TRUE)
+	radio.talk_into(src, "There are positronic personalities available!", science_channel)
+	playsound(loc, 'sound/machines/ping.ogg', 50)
+	addtimer(CALLBACK(src, .proc/liftcooldown), 300)
+
+/obj/machinery/posialert/proc/liftcooldown()
+	inuse = FALSE