Cashier and user improvements (RTC-43142)

• Cashier cannot be created with a nonpositive cashier number.
• The user name cannot contain "/", "\" or space characters.

Export picking status blobs when picked in external system (RTC-43794)

Now the status of picking from an external order picking system like AutoStore will be updated in external systems (via Picking status blobs), So that  that the information we see in the picking order is correct, and  the external systems will get the correct status.