[Search] Add seperator for categories & plugins

Sort categories & plugins entries
Rename & reorder entries
Use full name for plugins

src/gui/search/searchwidget.h

@@ -71,7 +71,7 @@ private slots:
     void searchStarted();
     void searchFinished(bool cancelled);
     void searchFailed();
-    void selectMultipleBox(const QString &text);
+    void selectMultipleBox(int index);
 
     void saveResultsColumnsWidth();
     void fillCatCombobox();