Add qt6

The goal is to support both Qt5 and Qt6 when building the examples and also when building the Cxx tarballs.

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• e49336e9 - Removing extra spaces

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@ben.boeckel when you get a chance would you mind having a look at this MR.

It ensures that vtk-examples supports Qt6 and Qt5. I have tested against Qt6 (6.0.1) and Qt5 (5.15.2) and everything works Ok. VTKQtCMakeLists is the template used to create the CMakeLists.txt for the tarred examples that are automatically generated when I update the web pages.. FYI I attach CMakeLists.zip that is automatically generated for the BarChartQt example. This was also tested for Qt6 and Qt5.

Thanks Andrew

added 1 commit

• cae73192 - Just search for Qt${VTK_QT_VERSION} with a component list based on the variable.

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resolved all threads

mentioned in commit 55646968

merged