Merge branch '369-upgrade-pythia-to-version-8-3xx' into 'master'

corsika/detail/modules/pythia8/Decay.inl

corsika/detail/modules/pythia8/Interaction.inl

corsika/framework/core/Cascade.hpp

corsika/framework/geometry/Vector.hpp

corsika/modules/conex/CONEX_f.hpp

corsika/modules/pythia8/Interaction.hpp

examples/cascade_example.cpp

examples/cascade_proton_example.cpp

examples/corsika.cpp

examples/hybrid_MC.cpp

examples/mars.cpp

examples/vertical_EAS.cpp

examples/water.cpp

modules/pythia8/CMakeLists.txt

modules/pythia8/pythia8307.tgz

src/framework/core/ParticleData.xml

src/framework/core/code_generator.py

src/modules/sibyll/code_generator.py

src/modules/sibyll/sibyll_codes.dat

tests/modules/testPythia8.cpp