Add SPDX Generation and packaging support

Mathieu Westphal (Kitware)requested to merge
mwestphal/paraview-superbuild:spdx_support into master
  • Set SPDX related variables for ParaView
  • Add SPDX packaging code
  • Add SPDX information to all projects
  • Fix a few licensing issues
Edited by Mathieu Westphal (Kitware)

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