- add actions to list, text-info and icons dialogs
- use optional gtksourceview in text-info dialog (done)
- add slideshow to picture dialog (reading uris from stdin)
- add single model for completion and combo-boxes
- add menu for select encodings in html dialog
- add reverse check column for list dialog
- add option for output format of boolean values (upper, lower, num)
- add tooltips for labels
- add custom handlers for edit and delete actions in editable lists
