* [geant4] new version 11.0.0
* [geant4] prefer 10.7.3 for now
* [vecgeom] new version 1.1.18
* [clhep] new version 2.4.5.1
* [g4emlow] new version 8.0
* [g4particlexs] new version 4.p
* [geant4-data] new version 11.0.0
* [geant4] @11.0.0: cxxstd=17: ^clhep@2.4.5.1: ^vecgeom@1.1.18:
* [geant4] depends_on cmake@3.16:
* [geant4-data] remove g4tendl comment
* [g4tendl] new version 1.4
* [geant4] default cxxstd=11 when @10, 17 when @11; use CMAKE_CXX_STANDARD
* [geant4] variant tbb whe @11:, depends_on tbb, sets GEANT4_USE_TBB
* [geant4] new variant vtk when @11:, depends_on vtk@8.2:
* [geant4] simplify GEANT4_USE_VTK with define_from_variant
* [geant4] remove variant cxxstd conditional again
* [geant4] flake8 space after comma
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