Merge branch 'refactory-2020' into 'master'

Environment/HomogeneousMedium.h

Environment/InhomogeneousMedium.h

Environment/LinearApproximationIntegrator.h

Environment/NoMagneticField.h

Environment/NuclearComposition.h

Environment/ShowerAxis.cc

Environment/ShowerAxis.h

Environment/VolumeTreeNode.h

Environment/testEnvironment.cc

Framework/Analytics/CMakeLists.txt

Framework/CMakeLists.txt

Framework/Cascade/CMakeLists.txt

Framework/Cascade/Cascade.dox

Framework/Cascade/Cascade.h

Framework/Cascade/testCascade.h

Framework/Geometry/BaseTrajectory.h

Framework/Geometry/BaseVector.h

Framework/Geometry/CMakeLists.txt

Framework/Geometry/CoordinateSystem.cc

Framework/Geometry/CoordinateSystem.h