Merge branch 'better_examples' into 'master'

.gitlab-ci.yml

corsika/detail/framework/core/Cascade.inl

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/SecondariesProcess.hpp

corsika/detail/framework/process/StackProcess.hpp

corsika/detail/modules/proposal/ContinuousProcess.inl

corsika/detail/setup/SetupStack.hpp

corsika/framework/process/ProcessTraits.hpp

corsika/framework/stack/ParticleBase.hpp

corsika/framework/stack/SecondaryView.hpp

corsika/framework/stack/Stack.hpp

corsika/framework/stack/StackIteratorInterface.hpp

corsika/framework/utility/HasMethodSignature.hpp

corsika/modules/qgsjetII/QGSJetIIFragmentsStack.hpp

corsika/modules/qgsjetII/QGSJetIIStack.hpp

corsika/modules/sibyll/SibStack.hpp

corsika/setup/SetupStack.hpp