- adds sphere without interface

src/GridGenerator/geometries/Sphere/Sphere.cpp

src/GridGenerator/geometries/Sphere/Sphere.cu

src/GridGenerator/geometries/Sphere/Sphere.h

src/GridGenerator/geometries/Sphere/SphereMocks.h

src/GridGenerator/grid/GridBuilder/LevelGridBuilder.cpp

src/GridGenerator/grid/GridBuilder/MultipleGridBuilder.cpp

src/GridGenerator/grid/GridBuilder/MultipleGridBuilder.h

...ridGenerator/grid/GridBuilder/MultipleGridBuilderTest.cpp

src/GridGenerator/grid/GridFactory.h

src/GridGenerator/grid/GridImp.cu

src/GridGenerator/grid/GridImp.cuh

src/GridGenerator/grid/GridMocks.h

...tor/grid/GridStrategy/GridCpuStrategy/GridCpuStrategy.cpp

src/GridGenerator/grid/NodeValues.h

src/GridGenerator/grid/kernel/runGridKernelGPU.cu

src/GridGenerator/io/GridVTKWriter/GridVTKWriter.cpp

targets/apps/HULC/main.cpp