Merge branch 'feature/tensor-produc-for-discrete-function-p0' into 'develop'

src/language/modules/MathFunctionRegisterForVh.cpp

src/language/modules/MathModule.cpp

src/language/utils/EmbeddedDiscreteFunctionMathFunctions.cpp

src/language/utils/EmbeddedDiscreteFunctionMathFunctions.hpp

src/scheme/DiscreteFunctionP0.hpp

tests/test_BuiltinFunctionProcessor.cpp

tests/test_DiscreteFunctionP0.cpp

tests/test_EmbeddedDiscreteFunctionMathFunctions1D.cpp

tests/test_EmbeddedDiscreteFunctionMathFunctions2D.cpp

tests/test_EmbeddedDiscreteFunctionMathFunctions3D.cpp

tests/test_MathModule.cpp