Added ability to find the editing terminal of an order

Starting from V6/V6Preview5, the method IOperationService.GetLastChangedOrderTerminal(IOrder order) has been added, which returns IHostTerminal.

This method can be useful if you want to keep a log of actions related to the order in connection with the current terminal. You can determine whether the save was made on the current terminal as follows:

PluginContext.Operations.GetHostTerminal().Equals(PluginContext.Operations.GetLastChangedOrderTerminal(order))