Improved status message filtering

* avoid re-init of widget if already initialized
* allow icons instead of text for severity radio buttons
* changing severity filter directly triggers new filtering
* use icon for new button
* init this->showFilterBar() as default (otherwise not functional)
* widths for filter bar buttons

src/blackgui/components/logcomponent.h

@@ -75,6 +75,9 @@ namespace BlackGui
             //! Show a filter bar
             void showFilterBar();
 
+            //! Set fi
+            void filterUseRadioButtonDescriptiveIcons(bool oneLetterText);
+
             //! Clear
             void clear();