Merge branch 'hp' into 'master'

.gitlab-ci.yml

CMakeLists.txt

README.rst

cmake/FindSphinx.cmake

corsika/detail/framework/process/BoundaryCrossingProcess.hpp

corsika/detail/framework/process/ContinuousProcess.hpp

corsika/detail/framework/process/DecayProcess.hpp

corsika/detail/framework/process/InteractionProcess.hpp

corsika/detail/framework/process/ProcessSequence.inl

corsika/detail/framework/process/SecondariesProcess.hpp

corsika/detail/framework/process/StackProcess.hpp

corsika/detail/framework/process/SwitchProcessSequence.inl

corsika/detail/media/NuclearComposition.inl

corsika/detail/modules/TrackWriter.inl

corsika/detail/modules/conex/CONEXhybrid.inl

corsika/detail/modules/qgsjetII/Interaction.inl

corsika/framework/core/Cascade.hpp

corsika/framework/core/Logging.hpp

corsika/framework/core/ParticleProperties.hpp

corsika/framework/process/BaseProcess.hpp