Initial support for NewGRF road stops (bus and lorry stops)

src/newgrf_extension.h

@@ -39,6 +39,12 @@ enum Action0RemapPropertyIds {
 	A0RPI_OBJECT_FLOOD_RESISTANT,
 	A0RPI_OBJECT_VIEWPORT_MAP_TYPE,
 	A0RPI_OBJECT_VIEWPORT_MAP_SUBTYPE,
+	A0RPI_ROADSTOP_CLASS_ID,
+	A0RPI_ROADSTOP_STOP_TYPE,
+	A0RPI_ROADSTOP_STOP_NAME,
+	A0RPI_ROADSTOP_CLASS_NAME,
+	A0RPI_ROADSTOP_DRAW_MODE,
+	A0RPI_ROADSTOP_TRIGGER_CARGOES,
 };