[Feature] Improvement of Charts

[NEKolev]

1. If possible, the unique items can be added to the absolute number. Description here [Feature Request] Add counter to the List Tree #183 (comment)
2. Ability to save charts in SVG format - I think it would be better when a chart needs to be printed on paper.
3. The legend, if possible, can be in the diagram, as with the pie chart, to make the text clearer. The second example from the site https://doc.qt.io/qt-6/qtcharts-legend-example.html
   
4. If you can add the possibility of ordering large to small, from small to large, A-Z, Z-A.

The pictures were taken on version Dev v1.9.9.12 Portable because the installation one is broken.