Kexi/Plugins/Reports/Object tree
https://bugs.kde.org/show_bug.cgi?id=339312
TODO... add structure like for other design pages (e.g. Kexi/Plugins/Reports/Report_hyperlinks), add content
Requirements
- The tree must present hierarchy of all sections, then elements in each section.
- Even invisible section shall be displayed in the tree. Show/hide action for such tree items could be available for quick access.
- Report itself is an (selectable) object and has properties, so it shall be a root of the tree
- TODO...