Merge remote-tracking branch 'upstream/development' into camera_and_editor_viewport_widget_improvements

Signed-off-by: Yuriy Toporovskyy <toporovskyy.y@gmail.com>

Code/Editor/Viewport.cpp

@@ -191,7 +191,7 @@ QtViewport::QtViewport(QWidget* parent)
     }
     m_screenTM.SetIdentity();
 
-    m_pMouseOverObject = 0;
+    m_pMouseOverObject = nullptr;
 
     m_bAdvancedSelectMode = false;
 
@@ -397,7 +397,7 @@ void QtViewport::OnDeactivate()
 //////////////////////////////////////////////////////////////////////////
 void QtViewport::ResetContent()
 {
-    m_pMouseOverObject = 0;
+    m_pMouseOverObject = nullptr;
 
     // Need to clear visual object cache.
     // Right after loading new level, some code(e.g. OnMouseMove) access invalid