GitLab

Organizationally, it makes more sense for the python utility classes
to be placed in Wrapping/Python than in Common.  This means adding a
new library called vtkPythonCore that represents the core python
support for VTK, as compared to VTK classes for individual kits like
Common/vtkPythonCommand.cxx and Rendering/vtkTkRenderWidgetPython.cxx.

ENH: Cleaned up vtkConfigure.h and vtkToolkits.h to be more organized and reduce namespace pollution.

- provide TCL_TK_STATIC,
- encapsulate #include tcl.h / tk.h inside vtkTcl.h / vtkTk.h so that we can support static Tcl/Tk
- add missing imm32 / comctl32