Ref T84, fix for better readibility of news / hyperlinks

* adjust palette to change link color: hardcoded, but no other way per stylesheet
* stylesheet fix to avoid black font in table view (CTRL S)

Remark:
Currently we just display the blog page as news, which is not correctly formatted, but somehow works.
In the future we might use a tailored HTML page for that.

src/blackgui/guiapplication.h

@@ -229,6 +229,9 @@ namespace BlackGui
 
         //! Check new from menu
         void checkNewVersionMenu();
+
+        //! Fix the palette for better readibility
+        void adjustPalette();
     };
 } // ns