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ENH: Added option to use TBB as SMP backend in VTK

Andras Lasso requested to merge github/fork/lassoan/vtk-use-tbb-smp-backend into master

It significantly improves vtk speed (typically by 20-30%, in some situations by a factor of 10x or more).

The change has been tested on Windows (building, running, packaging).

Linux build may need a patch (see TODO:) and Mac build may need some work with rpaths.

To test: when configuring Slicer build, set Slicer_VTK_SMP_IMPLEMENTATION_TYPE CMake variable to TBB.

This is a follow-up of (probably this will make that pull request obsolete).

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