debugger: make breakpoint marker clickable

Change-Id: Id04d63cbc57ab835721ee2d6aa7b4cb836d496db
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/breakpointmarker.h

@@ -48,6 +48,8 @@ public:
     void updateFileName(const QString &fileName);
     bool isDraggable() const { return true; }
     void dragToLine(int lineNumber);
+    bool isClickable() const { return true; }
+    void clicked();
 
 private:
     BreakpointModelId m_id;