Add common interface for text formats inside syntax highlighter

Change-Id: I87f64446161a57aea0896f68e4eafacef791969b
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/plugins/cmakeprojectmanager/cmakeeditor.h

@@ -85,7 +85,6 @@ protected:
 
 public slots:
     void unCommentSelection();
-    void setFontSettings(const TextEditor::FontSettings &);
 
 private:
     CMakeEditorFactory *m_factory;