Replace helperMethods.h with buildTestbedModel.cpp
Replace helperMethods.h with buildTestbedModel.cpp

[ci skip]
opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core