clang-tidy --fix: some automatic modernization of Fit/

.clang-tidy

Fit/Adapter/MinimizerAdapter.cpp

Fit/Adapter/MinimizerAdapter.h

Fit/Adapter/ObjectiveFunctionAdapter.cpp

Fit/Adapter/Report.cpp

Fit/Adapter/ResidualFunctionAdapter.cpp

Fit/Adapter/RootResidualFunction.cpp

Fit/Adapter/ScalarFunctionAdapter.cpp

Fit/Adapter/ScalarFunctionAdapter.h

Fit/Kernel/Kernel.h

Fit/Kernel/Minimizer.h

Fit/Kernel/MinimizerFactory.cpp

Fit/Minimizer/MinimizerInfo.h

Fit/Minimizer/MinimizerOptions.cpp

Fit/Param/Attributes.h

Fit/Param/Parameter.cpp

Fit/Param/Parameter.h

Fit/Param/RealLimits.h

Fit/TestEngine/MinimizerTestPlan.h

Fit/Tools/MultiOption.cpp