Merge branch '648-remove-environment-from-sibyll-interaction-class' into 'master'

applications/c8_air_shower.cpp

corsika/detail/media/Environment.inl

corsika/detail/modules/fluka/InteractionModel.inl

corsika/detail/modules/sibyll/NuclearInteractionModel.inl

corsika/media/Environment.hpp

corsika/media/IEmpty.hpp

corsika/modules/Sibyll.hpp

corsika/modules/fluka/InteractionModel.hpp

corsika/modules/sibyll/NuclearInteractionModel.hpp

examples/cascade_examples/em_shower.cpp

examples/cascade_examples/mars.cpp

examples/cascade_examples/mc_conex.cpp

examples/cascade_examples/radio_em_shower.cpp

examples/cascade_examples/water.cpp

examples/framework_examples/environment.cpp

modules/data

tests/media/testEnvironment.cpp

tests/modules/testCONEX.cpp

tests/modules/testFluka.cpp

tests/modules/testSibyll.cpp