Merge topic 'refactor_python_interpretor' into master

Rendering/Matplotlib/module.cmake

Rendering/Matplotlib/vtkMatplotlibMathTextUtilities.cxx

Rendering/Matplotlib/vtkMatplotlibMathTextUtilities.h

Utilities/PythonInterpreter/CMakeLists.txt

Utilities/PythonInterpreter/module.cmake

...ies/PythonInterpreter/vtkPythonInteractiveInterpreter.cxx

...ities/PythonInterpreter/vtkPythonInteractiveInterpreter.h

Utilities/PythonInterpreter/vtkPythonInterpreter.cxx

Utilities/PythonInterpreter/vtkPythonInterpreter.h

...ities/PythonInterpreter/vtkPythonStdStreamCaptureHelper.h

Wrapping/PythonCore/vtkPythonCommand.cxx

Wrapping/PythonCore/vtkPythonUtil.cxx

Wrapping/PythonCore/vtkPythonUtil.h