Feature request - changes to OrderList columns

[ivaigor96]

On the order list screen /Admin/UI/Ecommerce/OrderList there are a few issues and fields that are useful and are sometimes requested by the customer

1. The fields for billing and shipping are named the same and it's not clear which is which. e.g. Billing name, Shipping name would be more readable

2. The field OrderCustomerNumber is a very useful field for B2B customers, but it's not available in this screen

3. The User field is just a user ID, not very useful, a username would be more useful for getting a quick overview

4. The field Created by under the order details (this is the username and name of the secondary user - the one that is impersonating) would be useful on the order list for customers that use impersonation a lot in their business model