rename Gamma to Photon

corsika/detail/framework/core/ParticleProperties.inl

corsika/detail/modules/LongitudinalProfile.inl

corsika/detail/modules/ParticleCut.inl

corsika/detail/modules/conex/CONEXhybrid.inl

corsika/detail/modules/urqmd/UrQMD.inl

corsika/framework/core/ParticleProperties.hpp

corsika/framework/units/other_units.hpp

corsika/modules/LongitudinalProfile.hpp

corsika/modules/ParticleCut.hpp

corsika/modules/conex/CONEXhybrid.hpp

corsika/modules/energy_loss/Properties8.dat

corsika/modules/proposal/ContinuousProcess.hpp

corsika/modules/proposal/Interaction.hpp

corsika/modules/proposal/ProposalProcessBase.hpp

examples/em_shower.cpp

src/framework/core/ParticleClassNames.xml

src/modules/sibyll/sibyll_codes.dat

tests/framework/testParticles.cpp

tests/modules/conex_output_REF.txt

tests/modules/testCONEX.cpp