Add Order Number Prefix/Suffix once imported from Channel

[JoeMcG]

It would be useful to add either a custom Prefix/Suffix to order numbers once they have been imported into Shipstation.

E.g. When importing from EBay the order number is a randomly generated string of numbers. If you run many stores this makes it hard to differentiate between orders between the different EBay Channels. 

Allowing a custom prefix to be added would allow the data to be easier to view and to manage.