Timetable: Implement autofill/automate for taken conditional orders.

Fix wrong timetable values being set after using skip or send to depot.
Add timetabled flag for conditional order branch taken travel time.

src/vehicle_base.h

@@ -855,8 +855,10 @@ private:
 				this->cur_real_order_index++;
 				if (this->cur_real_order_index >= this->GetNumOrders()) this->cur_real_order_index = 0;
 			} while (this->GetOrder(this->cur_real_order_index)->IsType(OT_IMPLICIT));
+			this->cur_timetable_order_index = this->cur_real_order_index;
 		} else {
 			this->cur_real_order_index = 0;
+			this->cur_timetable_order_index = INVALID_VEH_ORDER_ID;
 		}
 	}
 
@@ -931,6 +933,16 @@ public:
 		return (this->orders.list == NULL) ? NULL : this->orders.list->GetOrderAt(index);
 	}
 
+	/**
+	 * Get the index of an order of the order chain, or INVALID_VEH_ORDER_ID.
+	 * @param order order to get the index of.
+	 * @return the position index of the given order, or INVALID_VEH_ORDER_ID.
+	 */
+	inline VehicleOrderID GetIndexOfOrder(const Order *order) const
+	{
+		return (this->orders.list == NULL) ? INVALID_VEH_ORDER_ID : this->orders.list->GetIndexOfOrder(order);
+	}
+
 	/**
 	 * Returns the last order of a vehicle, or NULL if it doesn't exists
 	 * @return last order of a vehicle, if available