Add company setting for remain at station if next order for same station

Set value on load for whether the save version had this enabled for trains

src/settings_type.h

@@ -768,6 +768,7 @@ struct CompanySettings {
 	uint16 timetable_autofill_rounding;      ///< round up timetable times to be a multiple of this number of ticks
 	bool advance_order_on_clone;             ///< when cloning a vehicle or copying/sharing an order list, advance the current order to a suitable point
 	bool copy_clone_add_to_group;            ///< whether to add cloned vehicles to the source vehicle's group, when cloning a vehicle without sharing orders
+	bool remain_if_next_order_same_station;  ///< if the next order is for the same station, start loading/unloading again instead of leaving.
 
 	byte old_simulated_wormhole_signals;     ///< no longer needs a setting: tunnel/bridge signal simulation spacing
 };