Editor code: tidy up BOOLs,NULLs and overrides pt5. (#2876)

A few 'typedefs' replaced by 'using's
This shouldn't have any functional changes at all, just c++17 modernization
It's a part 5 of a split #2847

Signed-off-by: Nemerle <nemerle5+git@gmail.com>

Co-authored-by: Nemerle <nemerle5+git@gmail.com>

Code/Editor/CustomizeKeyboardDialog.cpp

@@ -87,7 +87,7 @@ public:
         : QAbstractListModel(parent)
     {
     }
-    virtual ~MenuActionsModel() {}
+    ~MenuActionsModel() override {}
 
     int rowCount([[maybe_unused]] const QModelIndex& parent = QModelIndex()) const override
     {
@@ -134,7 +134,7 @@ public:
         , m_action(nullptr)
     {
     }
-    virtual ~ActionShortcutsModel() {}
+    ~ActionShortcutsModel() override {}
 
     int rowCount([[maybe_unused]] const QModelIndex& parent = QModelIndex()) const override
     {