Merge branch 'rprechelt-output' into 'master'

.gitlab-ci.yml

.gitmodules

CMakeLists.txt

MAINTAINERS.md

corsika/detail/framework/core/Cascade.inl

corsika/detail/framework/utility/CubicSolver.inl

corsika/detail/modules/ObservationPlane.inl

corsika/detail/modules/TrackWriter.inl

.../detail/modules/writers/ObservationPlaneWriterParquet.inl

corsika/detail/modules/writers/TrackWriterParquet.inl

corsika/detail/output/BaseOutput.inl

corsika/detail/output/DummyOutputManager.inl

corsika/detail/output/OutputManager.inl

corsika/detail/output/ParquetStreamer.inl

corsika/framework/core/Cascade.hpp

corsika/modules/ObservationPlane.hpp

corsika/modules/TrackWriter.hpp

corsika/modules/writers/ObservationPlaneWriterParquet.hpp

corsika/modules/writers/TrackWriterParquet.hpp

corsika/output/BaseOutput.hpp