Remove Setup from media and switch to BaseTrajectory.

corsika/detail/media/BaseExponential.inl

corsika/detail/media/FlatExponential.inl

corsika/detail/media/HomogeneousMedium.inl

corsika/detail/media/InhomogeneousMedium.inl

corsika/detail/media/LinearApproximationIntegrator.inl

corsika/detail/media/SlidingPlanarExponential.inl

corsika/framework/geometry/BaseTrajectory.hpp

corsika/framework/geometry/LeapFrogTrajectory.hpp

corsika/framework/geometry/StraightTrajectory.hpp

corsika/media/BaseExponential.hpp

corsika/media/FlatExponential.hpp

corsika/media/HomogeneousMedium.hpp

corsika/media/IEmpty.hpp

corsika/media/IMediumModel.hpp

corsika/media/InhomogeneousMedium.hpp

corsika/media/LinearApproximationIntegrator.hpp

corsika/media/SlidingPlanarExponential.hpp

tests/common/SetupTestTrajectory.hpp

tests/media/testEnvironment.cpp

tests/media/testMagneticField.cpp