Ability to create delivery without a client

Starting from V7, the ability to create a delivery without a client has been added.

From V7 in delivery DeliveryOrder client has become an optional field, and in the method CreateDeliveryOrder it becomes possible not to specify a client when creating a delivery. The phone number of the anonymous client corresponds to the phone number from the delivery Phone. In DeliveryOrder new property added ClientName - client name. This field is optional and is only used if no client is specified. For change ClientName new method added ChangeDeliveryClientName.