3-State SortDescriptions

[VisualAlf]

I'd suggest to have sorting (by clicking the columnheader) go through 3 states instead of 2. So. clicking on a columnheader goes :

none -(click)-> ascending -(click)-> descending -(click)-> none -> -(click)-> ascending...

making it possible to clear sorting with 1 click, instead of opening the contextmenu and then select 'Clear sorting'.

Btw: I really like this component.

[w-ahmad]

Thank you @VisualAlf for your suggestions, I'll try to make it available in 1.3.