Add override keyword through the code.

This was automated using `clang-modernize`.

src/citra_qt/bootmanager.cpp

@@ -90,10 +90,10 @@ public:
         parent_ = parent;
     }
 
-    void paintEvent(QPaintEvent* ev)
+    void paintEvent(QPaintEvent* ev) override
     {
     }
-    void resizeEvent(QResizeEvent* ev) {
+    void resizeEvent(QResizeEvent* ev) override {
         parent_->SetClientAreaWidth(size().width());
         parent_->SetClientAreaHeight(size().height());
     }

src/citra_qt/bootmanager.hxx

@@ -25,7 +25,7 @@ public:
      *
      * @warning Only call when not running!
      */
-    void run();
+    void run() override;
 
     /**
      * Allow the CPU to process a single instruction (if cpu is not running)
@@ -89,13 +89,13 @@ public:
     GRenderWindow(QWidget* parent = NULL);
     ~GRenderWindow();
 
-    void closeEvent(QCloseEvent*);
+    void closeEvent(QCloseEvent*) override;
 
     // EmuWindow implementation
-    void SwapBuffers();
-    void MakeCurrent();
-    void DoneCurrent();
-    void PollEvents();
+    void SwapBuffers() override;
+    void MakeCurrent() override;
+    void DoneCurrent() override;
+    void PollEvents() override;
 
     void BackupGeometry();
     void RestoreGeometry();
@@ -104,8 +104,8 @@ public:
 
     EmuThread& GetEmuThread();
 
-    void keyPressEvent(QKeyEvent* event);
-    void keyReleaseEvent(QKeyEvent* event);
+    void keyPressEvent(QKeyEvent* event) override;
+    void keyReleaseEvent(QKeyEvent* event) override;
 
     void ReloadSetKeymaps() override;
 

src/citra_qt/debugger/graphics_cmdlists.hxx

@@ -17,7 +17,7 @@ class GPUCommandListModel : public QAbstractListModel
 public:
     GPUCommandListModel(QObject* parent);
 
-    int columnCount(const QModelIndex& parent = QModelIndex()) const;
+    int columnCount(const QModelIndex& parent = QModelIndex()) const override;
     int rowCount(const QModelIndex& parent = QModelIndex()) const override;
     QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
 

src/citra_qt/main.hxx

@@ -32,7 +32,7 @@ public:
 private:
     void BootGame(std::string filename);
 
-    void closeEvent(QCloseEvent* event);
+    void closeEvent(QCloseEvent* event) override;
 
 private slots:
     void OnStartGame();