[789-deprecate-content-of-globaldefinitions] define Eps per class/func

FWI/src/FWI_DGTS.cpp

FWI/src/ForwardModels/ForwardModel.hpp

FWI/src/Helper/ABCHandler.cpp

FWI/src/Helper/ABCHandler.hpp

FWI/src/Helper/FWIMppHelpers.cpp

FWI/src/Helper/NormCalculation.hpp

FWI/src/Observation/FWIObservationOperatorSpaceDGTS.hpp

FWI/src/Problems/FWIProblemsDGTSVA.cpp

FWI/src/VAcousticMatFromVec.hpp

FWI/tests/FWITestLinearizedAdjoint.cpp