added central macro for adding and configuring unit tests

#.gitlab-ci.yml#

.gitlab-ci.yml

CMakeModules/CorsikaUtilities.cmake

Environment/CMakeLists.txt

Framework/Cascade/CMakeLists.txt

Framework/Geometry/CMakeLists.txt

Framework/Logging/CMakeLists.txt

Framework/Particles/CMakeLists.txt

Framework/ProcessSequence/CMakeLists.txt

Framework/Random/CMakeLists.txt

Framework/StackInterface/CMakeLists.txt

Framework/Units/CMakeLists.txt

Framework/Utilities/CMakeLists.txt

Processes/NullModel/CMakeLists.txt

Processes/Sibyll/CMakeLists.txt

Processes/StackInspector/CMakeLists.txt

Processes/TrackWriter/CMakeLists.txt

Processes/TrackingLine/CMakeLists.txt

Stack/SuperStupidStack/CMakeLists.txt