Using override keyword in most apps

Detected by clang-tidy's modernize-use-override

Future MRs can be created to run this on OpenMW and OpenMW CS

apps/essimporter/importcellref.hpp

@@ -27,7 +27,7 @@ namespace ESSImport
 
         void load(ESM::ESMReader& esm) override;
 
-        virtual ~CellRef() = default;
+        ~CellRef() override = default;
     };
 
 }

apps/launcher/maindialog.hpp

@@ -47,7 +47,7 @@ namespace Launcher
 
     public:
         explicit MainDialog(QWidget *parent = nullptr);
-        ~MainDialog();
+        ~MainDialog() override;
 
         FirstRunDialogResult showFirstRunDialog();
 

apps/launcher/settingspage.hpp

@@ -22,7 +22,7 @@ namespace Launcher
     public:
         SettingsPage(Files::ConfigurationManager &cfg, Config::GameSettings &gameSettings,
                       Config::LauncherSettings &launcherSettings, MainDialog *parent = nullptr);
-        ~SettingsPage();
+        ~SettingsPage() override;
 
         void saveSettings();
         bool loadSettings();

apps/launcher/utils/textinputdialog.hpp

@@ -16,7 +16,7 @@ namespace Launcher
     public:
 
         explicit TextInputDialog(const QString& title, const QString &text, QWidget *parent = nullptr);
-        ~TextInputDialog ();
+        ~TextInputDialog () override;
 
         inline LineEdit *lineEdit() { return mLineEdit; }
         void setOkButtonEnabled(bool enabled);

apps/wizard/installationpage.hpp

@@ -20,7 +20,7 @@ namespace Wizard
         Q_OBJECT
     public:
         InstallationPage(QWidget *parent);
-        ~InstallationPage();
+        ~InstallationPage() override;
 
         int nextId() const override;
          bool isComplete() const override;

apps/wizard/mainwizard.hpp

@@ -40,7 +40,7 @@ namespace Wizard
         };
 
         MainWizard(QWidget *parent = nullptr);
-        ~MainWizard();
+        ~MainWizard() override;
 
         bool findFiles(const QString &name, const QString &path);
         void addInstallation(const QString &path);

apps/wizard/unshield/unshieldworker.hpp

@@ -27,7 +27,7 @@ namespace Wizard
 
     public:
         UnshieldWorker(QObject *parent = nullptr);
-        ~UnshieldWorker();
+        ~UnshieldWorker() override;
 
         void stopWorker();