Change station cargo history storage format

Use uint16 to avoid truncation issues
Don't reserve memory for unused cargoes
Store history as ring buffer
Update history graph immediately on storage date
Show total waiting cargo

src/station_gui.cpp

@@ -1366,6 +1366,12 @@ struct StationViewWindow : public Window {
 		SetViewportCatchmentStation(Station::Get(this->window_number), false);
 	}
 
+	void OnInit() override
+	{
+		const Station *st = Station::Get(this->window_number);
+		SetWidgetDisabledState(WID_SV_HISTORY, st->station_cargo_history_cargoes == 0);
+	}
+
 	/**
 	 * Show a certain cargo entry characterized by source/next/dest station, cargo ID and amount of cargo at the
 	 * right place in the cargo view. I.e. update as many rows as are expanded following that characterization.