Ports tgstation/-tg-station#16569, World Topic() changes

Full changes:
 - World Topic() is now standardized to use if("parameter" in topic_list)
   instead of an amalgamation of findtext() and if(topic == "parameter").
 - Comms password is now verified at the top of world/Topic() and sets a
   variable to true if it is present and correct.
 - "status" now returns extra information if the comms_password is
   provided and correct.

Misc changes:
 - Shuttle text has been standardized as a proc on mobile docking ports.
   This is used by status/supply displays and mob/Stat() for the -ETA- etc stuff.

code/modules/mob/mob.dm

@@ -995,28 +995,9 @@ var/list/slot_equipment_priority = list( \
 /mob/proc/show_stat_emergency_shuttle_eta()
 	var/obj/docking_port/mobile/emergency/E = shuttle_master.emergency
 
-	if(E.mode >= SHUTTLE_RECALL)
-		var/message = ""
-
-		var/timeleft = E.timeLeft()
-		message = "[add_zero(num2text((timeleft / 60) % 60),2)]:[add_zero(num2text(timeleft % 60), 2)]"
-
-		switch(E.mode)
-			if(SHUTTLE_RECALL, SHUTTLE_ESCAPE)
-				message = "ETR-[message]"
-			if(SHUTTLE_CALL)
-				message = "ETA-[message]"
-			if(SHUTTLE_DOCKED)
-				if(timeleft < 5)
-					message = "Departing..."
-				else
-					message = "ETD-[message]"
-			if(SHUTTLE_STRANDED)
-				message = "ETA-ERR"
-			if(SHUTTLE_ENDGAME)
-				return
-
-		stat(null, message)
+	var/ETA = shuttle_master.emergency.getModeStr()
+	if(ETA)
+		stat(null, "[ETA] [shuttle_master.emergency.getTimerStr()]")
 
 /mob/proc/add_stings_to_statpanel(var/list/stings)
 	for(var/obj/effect/proc_holder/changeling/S in stings)

code/modules/shuttle/shuttle.dm

@@ -563,6 +563,32 @@
 		return round(callTime/divisor, 1)
 	return max( round((timer+callTime-world.time)/divisor,1), 0 )
 
+// returns 3-letter mode string, used by status screens and mob status panel
+/obj/docking_port/mobile/proc/getModeStr()
+	switch(mode)
+		if(SHUTTLE_RECALL)
+			return "RCL"
+		if(SHUTTLE_CALL)
+			return "ETA"
+		if(SHUTTLE_DOCKED)
+			return "ETD"
+		if(SHUTTLE_ESCAPE)
+			return "ESC"
+		if(SHUTTLE_STRANDED)
+			return "ERR"
+	return ""
+
+// returns 5-letter timer string, used by status screens and mob status panel
+/obj/docking_port/mobile/proc/getTimerStr()
+	if(mode == SHUTTLE_STRANDED)
+		return "--:--"
+
+	var/timeleft = timeLeft()
+	if(timeleft > 0)
+		return "[add_zero(num2text((timeleft / 60) % 60),2)]:[add_zero(num2text(timeleft % 60), 2)]"
+	else
+		return "00:00"
+
 /obj/docking_port/mobile/proc/getStatusText()
 	var/obj/docking_port/stationary/dockedAt = get_docked()
 	. = (dockedAt && dockedAt.name) ? dockedAt.name : "unknown"