Merge branch 'release-8.0.1' into release

Accelerators/Vtkm/vtkmAverageToCells.h

Accelerators/Vtkm/vtkmAverageToPoints.h

Accelerators/Vtkm/vtkmCleanGrid.h

Accelerators/Vtkm/vtkmClip.h

Accelerators/Vtkm/vtkmContour.h

Accelerators/Vtkm/vtkmExternalFaces.h

Accelerators/Vtkm/vtkmGradient.h

Accelerators/Vtkm/vtkmLevelOfDetail.h

Accelerators/Vtkm/vtkmThreshold.h

CMake/vtkVersion.cmake

Common/Core/vtkAbstractArray.cxx

Common/Core/vtkAbstractArray.h

Common/Core/vtkDataArray.cxx

Common/Core/vtkDataArray.h

Common/Core/vtkInformationKey.cxx

GUISupport/Qt/QVTKOpenGLWidget.cxx

GUISupport/Qt/QVTKWidget.cxx

GUISupport/Qt/Testing/Cxx/CMakeLists.txt

GUISupport/Qt/Testing/Cxx/TestQtSwapWindows.cxx

Interaction/Widgets/Testing/Cxx/CMakeLists.txt