[PL/T2PF] Clean-up: remove old material properties stuff

...hPP/CreateThermalTwoPhaseFlowWithPPMaterialProperties.cpp

...ithPP/CreateThermalTwoPhaseFlowWithPPMaterialProperties.h

...haseFlowWithPP/CreateThermalTwoPhaseFlowWithPPProcess.cpp

...FlowWithPP/ThermalTwoPhaseFlowWithPPLocalAssembler-impl.h

...PhaseFlowWithPP/ThermalTwoPhaseFlowWithPPLocalAssembler.h

...lowWithPP/ThermalTwoPhaseFlowWithPPMaterialProperties.cpp

...eFlowWithPP/ThermalTwoPhaseFlowWithPPMaterialProperties.h

...alTwoPhaseFlowWithPP/ThermalTwoPhaseFlowWithPPProcess.cpp

...rmalTwoPhaseFlowWithPP/ThermalTwoPhaseFlowWithPPProcess.h

...TwoPhaseFlowWithPP/ThermalTwoPhaseFlowWithPPProcessData.h