[sort-order] Add sort order details in the ColumnSheet

[frosencrantz]

It would be helpful to see the sort order in the ColumnSheet. It would be nice if sort order details could be modified from the ColumnSheet. Another option would be to have a separate sheet for showing/modifying the sort order of the columns in a sheet.

There are 2 bits that are useful for sort order, the order of the columns when performing the sort, and whether the column should be sorted, and the direction of the sort (ascending/descending).