[PCS] Changed the type of the process class member of process variables

ProcessLib/ComponentTransport/ComponentTransportProcess.cpp

ProcessLib/ComponentTransport/ComponentTransportProcess.h

ProcessLib/GroundwaterFlow/GroundwaterFlowProcess.cpp

ProcessLib/GroundwaterFlow/GroundwaterFlowProcess.h

ProcessLib/HT/HTProcess.cpp

ProcessLib/HT/HTProcess.h

ProcessLib/HeatConduction/HeatConductionProcess.cpp

ProcessLib/HeatConduction/HeatConductionProcess.h

ProcessLib/HydroMechanics/HydroMechanicsProcess-impl.h

ProcessLib/HydroMechanics/HydroMechanicsProcess.h

ProcessLib/LIE/HydroMechanics/HydroMechanicsProcess.cpp

ProcessLib/LIE/HydroMechanics/HydroMechanicsProcess.h

ProcessLib/LIE/SmallDeformation/SmallDeformationProcess.cpp

ProcessLib/LIE/SmallDeformation/SmallDeformationProcess.h

ProcessLib/LiquidFlow/LiquidFlowProcess.cpp

ProcessLib/LiquidFlow/LiquidFlowProcess.h

ProcessLib/PhaseField/PhaseFieldProcess-impl.h

ProcessLib/PhaseField/PhaseFieldProcess.h

...sComponentTransport/RichardsComponentTransportProcess.cpp

...rdsComponentTransport/RichardsComponentTransportProcess.h