Refactoring of EsoTwist classes

src/cpu/VirtualFluids.h

src/cpu/core/BoundaryConditions/BCSet.cpp

src/cpu/core/BoundaryConditions/ThinWallNoSlip.cpp

src/cpu/core/Connectors/FullDirectConnector.cpp

src/cpu/core/Connectors/FullVectorConnector.cpp

src/cpu/core/Connectors/OneDistributionFullDirectConnector.h

src/cpu/core/Connectors/OneDistributionFullVectorConnector.h

src/cpu/core/Connectors/RemoteBlock3DConnector.h

...s/ThreeDistributionsDoubleGhostLayerFullDirectConnector.h

...s/ThreeDistributionsDoubleGhostLayerFullVectorConnector.h

...u/core/Connectors/ThreeDistributionsFullDirectConnector.h

...u/core/Connectors/ThreeDistributionsFullVectorConnector.h

...ors/TwoDistributionsDoubleGhostLayerFullDirectConnector.h

...ors/TwoDistributionsDoubleGhostLayerFullVectorConnector.h

...cpu/core/Connectors/TwoDistributionsFullDirectConnector.h

...cpu/core/Connectors/TwoDistributionsFullVectorConnector.h

src/cpu/core/Data/D3Q27EsoTwist3DSoA.cpp

src/cpu/core/Data/D3Q27EsoTwist3DSoA.h

src/cpu/core/Data/D3Q27EsoTwist3DSplittedVector.cpp

src/cpu/core/Data/D3Q27EsoTwist3DSplittedVectorEx.cpp