fix time depended BC / refactor connectors / add infrastructure for two phase field

apps/cpu/LaminarTubeFlow/ltf.cfg

apps/cpu/LaminarTubeFlow/ltf.cpp

apps/cpu/Multiphase/Multiphase.cfg

apps/cpu/Multiphase/Multiphase.cpp

src/cpu/VirtualFluids.h

src/cpu/VirtualFluidsCore/BoundaryConditions/BCAlgorithm.h

...Core/BoundaryConditions/MultiphaseVelocityBCAlgorithm.cpp

...dsCore/BoundaryConditions/MultiphaseVelocityBCAlgorithm.h

src/cpu/VirtualFluidsCore/Connectors/Block3DConnector.h

...tualFluidsCore/Connectors/CoarseToFineVectorConnector.cpp

...irtualFluidsCore/Connectors/CoarseToFineVectorConnector.h

...tualFluidsCore/Connectors/D3Q27ETCFOffVectorConnector.cpp

...tualFluidsCore/Connectors/D3Q27ETFCOffVectorConnector.cpp

...tualFluidsCore/Connectors/FineToCoarseVectorConnector.cpp

...irtualFluidsCore/Connectors/FineToCoarseVectorConnector.h

src/cpu/VirtualFluidsCore/Connectors/FullDirectConnector.cpp

src/cpu/VirtualFluidsCore/Connectors/FullDirectConnector.h

src/cpu/VirtualFluidsCore/Connectors/FullVectorConnector.cpp

src/cpu/VirtualFluidsCore/Connectors/FullVectorConnector.h

...idsCore/Connectors/OneDistributionFullDirectConnector.cpp