"Air" -> "Vacuum"

Core/StandardSamples/BoxCompositionBuilder.cpp

Core/StandardSamples/BoxesSquareLatticeBuilder.cpp

Core/StandardSamples/CoreShellParticleBuilder.cpp

Core/StandardSamples/CustomMorphologyBuilder.cpp

Core/StandardSamples/CylindersAndPrismsBuilder.cpp

Core/StandardSamples/CylindersBuilder.cpp

Core/StandardSamples/LatticeBuilder.cpp

Core/StandardSamples/LayersWithAbsorptionBuilder.cpp

Core/StandardSamples/LayersWithAbsorptionBySLDBuilder.cpp

Core/StandardSamples/MagneticLayersBuilder.cpp

Core/StandardSamples/MagneticParticlesBuilder.cpp

Core/StandardSamples/MesoCrystalBuilder.cpp

Core/StandardSamples/MultiLayerWithRoughnessBuilder.cpp

Core/StandardSamples/MultipleLayoutBuilder.cpp

Core/StandardSamples/ParaCrystalBuilder.cpp

Core/StandardSamples/ParticleCompositionBuilder.cpp

Core/StandardSamples/ParticleDistributionsBuilder.cpp

Core/StandardSamples/ParticleInTheAirBuilder.cpp

Core/StandardSamples/PercusYevickBuilder.cpp

Core/StandardSamples/ReferenceMaterials.h