Editor code: tidy up BOOLs,NULLs and overrides pt1.

Merge pull request #2872 from nemerle/tidy_up_editor_code_a_bit_split1

Code/Editor/Core/LevelEditorMenuHandler.cpp

@@ -80,12 +80,12 @@ namespace
             , m_trigger(trigger)
         {}
 
-        virtual ~EditorListener()
+        ~EditorListener() override
         {
             GetIEditor()->UnregisterNotifyListener(this);
         }
 
-        void OnEditorNotifyEvent(EEditorNotifyEvent event)
+        void OnEditorNotifyEvent(EEditorNotifyEvent event) override
         {
             m_trigger(event);
         }

Code/Editor/Core/QtEditorApplication.cpp

@@ -423,7 +423,7 @@ namespace Editor
             {
                 UINT rawInputSize;
                 const UINT rawInputHeaderSize = sizeof(RAWINPUTHEADER);
-                GetRawInputData((HRAWINPUT)msg->lParam, RID_INPUT, NULL, &rawInputSize, rawInputHeaderSize);
+                GetRawInputData((HRAWINPUT)msg->lParam, RID_INPUT, nullptr, &rawInputSize, rawInputHeaderSize);
 
                 AZStd::array<BYTE, sizeof(RAWINPUT)> rawInputBytesArray;
                 LPBYTE rawInputBytes = rawInputBytesArray.data();

Code/Editor/Core/Tests/test_Main.cpp

@@ -26,7 +26,7 @@ class EditorCoreTestEnvironment
 public:
     AZ_TEST_CLASS_ALLOCATOR(EditorCoreTestEnvironment);
 
-    virtual ~EditorCoreTestEnvironment()
+    ~EditorCoreTestEnvironment() override
     {
     }