ClassView: Use Qt5-style connects

The heavy lifting was done by clazy.

Change-Id: I6aac0c1e66b24bb8b638aee906f9f355d2e23d48
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/classview/classviewmanager.h

@@ -72,7 +72,7 @@ signals:
 
     void requestSetFlatMode(bool flat);
 
-public slots:
+public:
     void gotoLocation(const QString &fileName, int line = 0, int column = 0);
 
     void gotoLocations(const QList<QVariant> &locations);
@@ -81,8 +81,9 @@ public slots:
 
     void setFlatMode(bool flat);
 
-protected slots:
     void onWidgetVisibilityIsChanged(bool visibility);
+
+protected:
     void onStateChanged(bool state);
     void onProjectListChanged();
     void onDocumentUpdated(CPlusPlus::Document::Ptr doc);