update license info in file header

applications/c8_air_shower.cpp

corsika/detail/framework/analytics/ClassTimer.inl

corsika/detail/framework/analytics/FunctionTimer.inl

corsika/detail/framework/core/Cascade.inl

corsika/detail/framework/core/Logging.inl

corsika/detail/framework/core/ParticleProperties.inl

corsika/detail/framework/core/SpdlogSpecializations.inl

corsika/detail/framework/geometry/BaseVector.inl

corsika/detail/framework/geometry/Box.inl

corsika/detail/framework/geometry/CoordinateSystem.inl

corsika/detail/framework/geometry/FourVector.inl

corsika/detail/framework/geometry/Helix.inl

corsika/detail/framework/geometry/LeapFrogTrajectory.inl

corsika/detail/framework/geometry/Line.inl

corsika/detail/framework/geometry/Path.inl

corsika/detail/framework/geometry/Plane.inl

corsika/detail/framework/geometry/Point.inl

corsika/detail/framework/geometry/QuantityVector.inl

corsika/detail/framework/geometry/SeparationPlane.inl

corsika/detail/framework/geometry/Sphere.inl