[PL] Pass process vars to BC and ST creation

...aryConditionAndSourceTerm/BoundaryConditionCollection.cpp

...oundaryConditionAndSourceTerm/CreateBoundaryCondition.cpp

.../BoundaryConditionAndSourceTerm/CreateBoundaryCondition.h

...ssLib/BoundaryConditionAndSourceTerm/CreateSourceTerm.cpp

ProcessLib/BoundaryConditionAndSourceTerm/CreateSourceTerm.h

...yConditionAndSourceTerm/Python/CreatePythonSourceTerm.cpp

...aryConditionAndSourceTerm/Python/CreatePythonSourceTerm.h

...b/BoundaryConditionAndSourceTerm/SourceTermCollection.cpp

ProcessLib/ProcessVariable.cpp

ProcessLib/ProcessVariable.h