[refactory-2020] stack implementations: more cleaning up

corsika/detail/framework/stack/CombinedStack.inl

corsika/detail/stack/NuclearStackExtension.inl

corsika/detail/stack/SuperStupidStack.inl

corsika/framework/stack/CombinedStack.hpp

corsika/framework/stack/ParticleBase.hpp

corsika/framework/stack/SecondaryView.hpp

corsika/framework/stack/Stack.hpp

corsika/framework/stack/StackIteratorInterface.hpp

corsika/stack/DummyStack.hpp

corsika/stack/GeometryNodeStackExtension.hpp

corsika/stack/NuclearStackExtension.hpp

corsika/stack/SuperStupidStack.hpp