[vtkusers] Deprecate Qt4

[Dan Lipsa]

Hi all,
We are working to deprecate VTK use of Qt4.

https://gitlab.kitware.com/vtk/vtk/merge_requests/3300

After this merge request is in, VTK_QT_VERSION will be 5 by default and
you'll get warnings if you switch it to 4 and use VTK with Qt4.

You can silence the warnings using
VTK_LEGACY_SILENT=ON

You can remove all legacy features using
VTK_LEGACY_REMOVE=ON
(You may want to do that if you compile with Qt5, to make sure you don't
use by mistake Qt4 features).

VTK + Qt applications using Qt5 need to use QVTKOpenGLWidget instead
of QVTKWidget that was used for Qt4.
https://www.vtk.org/doc/nightly/html/classQVTKOpenGLWidget.html

We converted all VTK Qt examples and the examples from VTKExamples to
use QVTKOpenGLWidget.

Here is the pull request for VTKExamples
https://github.com/lorensen/VTKExamples/pull/28


Thanks,
Dan
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