small visual adjustments
define exportable types
complete rework of the export functionality:
- added function exportAsFile(type) both as server and client function
- this currently gets executed on doubleclick
- can export many objects to one connected output file
- added shortcut function getInputPapers on server side
TODO:
- invent a better filename for export
- handle create-file and view-result-only differently (drag-drop vs. doubleclick of small icons)
- handle types of export via icon
adjust position of automatically created file
- specify position for exported file
- add drag-to-export support to export icons
- add selection highlighting class
- avoid some click related errors