The bookmark dialog inside Marble allows to create Bookmarks for certain places that the Marble user has visited. By default a star is assigned to the location that is bookmarked. It would be nice if this icon could be changed to something else by the user.

The focus of this task is to add an "Icon Link" row just like it's visible in the Annotation Plugin's Placemark dialog.

It should contain a label ("Icon Link"), a lineedit and a "Browse" Button which invokes a filedialog exactly like it's done in the annotation plugin.

By default the Icon Link should point to the star icon.