Instance View: Table Sorting should have 3 states and indicate sorting with arrows

How to reproduce:

1) make sure you have instance view opened and a few instances listed
2) click on a column

Result:
the column gets sorted, but there's no icon that shows the sort direction. Furthermore there are only 2 states: sorting ascending or descending

Expected result:
The column gets sorted and an icon shows what direction (ascending/descending) is activated. Furthermore you should be able to toggle between ascending/descending/not sorted by clicking consecutively on the same column