Qt/Debugger: Implement "Code" widget

Source/Core/DolphinQt2/Debugger/BreakpointWidget.h

@@ -25,6 +25,7 @@ public:
                      bool do_break = true);
   void AddRangedMBP(u32 from, u32 to, bool do_read = true, bool do_write = true, bool do_log = true,
                     bool do_break = true);
+  void Update();
 
 protected:
   void closeEvent(QCloseEvent*) override;
@@ -38,8 +39,6 @@ private:
   void OnLoad();
   void OnSave();
 
-  void Update();
-
   QToolBar* m_toolbar;
   QTableWidget* m_table;
   QAction* m_load;