Split ICellCF into border and bulk

apps/gpu/LBM/MusselOyster3z/MusselOyster3z.cpp

src/gpu/GridGenerator/grid/Grid.h

src/gpu/GridGenerator/grid/GridBuilder/GridBuilder.h

src/gpu/GridGenerator/grid/GridBuilder/LevelGridBuilder.cpp

src/gpu/GridGenerator/grid/GridBuilder/LevelGridBuilder.h

src/gpu/GridGenerator/grid/GridImp.cu

src/gpu/GridGenerator/grid/GridImp.h

...tructureInitializer/GridReaderGenerator/GridGenerator.cpp

src/gpu/VirtualFluids_GPU/Parameter/Parameter.h