Add sorting information to Entity-Export

Helmut Heimann

We currently get information about the members of an entity to be extracted as Code/Member for standard entities and Code/Member/Parent for UBHs.

Unfortunately, although there is an option to sort entity members by "Custom" (and we can import the sorting order for those entities), the sorting order information is missing when extracting such an entity.

Please add the sorting order of an entity to its extract in a separate column.