Allow sorting a livedata column based on the different property than the one used for the display

In some cases, you need the sorting of a column to be based on a different property than the one you display.

For example in the Repository application we have versions which don't make much sense when you sort them as String, so we have another property which contains a number index to sort them properly. But when you display it in a livedata it does not make much sense visual to have two different columns, and you would want the Version column to be sorted using the index but filtered and displayed using the version property.