First working CMake setup with 'switches' for the new monorepo

CMakeLists.txt

FullSimLight/CMakeLists.txt

GeoModelExamples/CMakeLists.txt

GeoModelExamples/GeoActions/CMakeLists.txt

GeoModelExamples/GeoActions/main.cpp

GeoModelExamples/GeoShapeExamples/CMakeLists.txt

GeoModelExamples/GeoShapeExamples/main.cpp

GeoModelExamples/GeoShiftUnion/CMakeLists.txt

GeoModelExamples/GeoShiftUnion/main.cpp

GeoModelExamples/GeoTessellatedSolidExamples/CMakeLists.txt

GeoModelExamples/GeoTessellatedSolidExamples/main.cpp

GeoModelExamples/GeoTessellatedSolidExamples/main.cpp.bkp

GeoModelExamples/HelloDummyMaterial/CMakeLists.txt

GeoModelExamples/HelloDummyMaterial/main.cpp

GeoModelExamples/HelloGeo/CMakeLists.txt

GeoModelExamples/HelloGeo/main.cpp

GeoModelExamples/HelloGeoRead/CMakeLists.txt

GeoModelExamples/HelloGeoRead/main.cpp

GeoModelExamples/HelloGeoRead2G4/CMakeLists.txt

GeoModelExamples/HelloGeoRead2G4/main.cpp