[READY] Adds night shifts (#4281)

* initial commit - adds night shifts

* fixes lighting not updating when nightshift is triggered and fixes compiling issues

* makes red alert override nightshift

* Update lighting.dm

* adds announcements for nightshift changes

* fixes nightshift flip-flopping during the night, adjusts night message a little, moves from minor_announce to priority_announce

* Update cit_nightshift.dm

* fixes compiling errors

code/modules/security_levels/security_levels.dm

@@ -41,6 +41,8 @@ GLOBAL_VAR_INIT(security_level, 0)
 					if(SSshuttle.emergency.mode == SHUTTLE_CALL || SSshuttle.emergency.mode == SHUTTLE_RECALL)
 						SSshuttle.emergency.modTimer(2)
 				GLOB.security_level = SEC_LEVEL_BLUE
+				sound_to_playing_players('sound/misc/voybluealert.ogg') // Citadel change - Makes alerts play a sound
+
 				for(var/obj/machinery/firealarm/FA in GLOB.machines)
 					if(is_station_level(FA.z))
 						FA.update_icon()
@@ -55,6 +57,7 @@ GLOBAL_VAR_INIT(security_level, 0)
 				else
 					minor_announce(CONFIG_GET(string/alert_red_downto), "Attention! Code red!")
 				GLOB.security_level = SEC_LEVEL_RED
+				sound_to_playing_players('sound/misc/voyalert.ogg') // Citadel change - Makes alerts play a sound
 
 				for(var/obj/machinery/firealarm/FA in GLOB.machines)
 					if(is_station_level(FA.z))
@@ -69,6 +72,8 @@ GLOBAL_VAR_INIT(security_level, 0)
 					else if(GLOB.security_level == SEC_LEVEL_BLUE)
 						SSshuttle.emergency.modTimer(0.5)
 				GLOB.security_level = SEC_LEVEL_DELTA
+				sound_to_playing_players('sound/misc/deltakalaxon.ogg') // Citadel change - Makes alerts play a sound
+
 				for(var/obj/machinery/firealarm/FA in GLOB.machines)
 					if(is_station_level(FA.z))
 						FA.update_icon()
@@ -79,6 +84,12 @@ GLOBAL_VAR_INIT(security_level, 0)
 				if(D.red_alert_access)
 					D.visible_message("<span class='notice'>[D] whirrs as it automatically lifts access requirements!</span>")
 					playsound(D, 'sound/machines/boltsup.ogg', 50, TRUE)
+    //Citadel change, makes red and delta alerts override nightshift lights
+			SSnightshift.nightshift_override = TRUE
+			if(SSnightshift.nightshift)
+				SSnightshift.nightshift = FALSE
+				SSnightshift.updatenightlights()
+		//End of citadel changes
 		SSblackbox.record_feedback("tally", "security_level_changes", 1, get_security_level())
 	else
 		return