Add mathematics functions applied to P0 discrete functions

src/language/modules/CMakeLists.txt

src/language/modules/MathFunctionRegisterForVh.cpp

src/language/modules/MathFunctionRegisterForVh.hpp

src/language/modules/SchemeModule.cpp

src/language/modules/SchemeModule.hpp

src/language/utils/CMakeLists.txt

...language/utils/EmbeddedIDiscreteFunctionMathFunctions.cpp

...language/utils/EmbeddedIDiscreteFunctionMathFunctions.hpp

src/language/utils/EmbeddedIDiscreteFunctionOperators.cpp

src/language/utils/EmbeddedIDiscreteFunctionUtils.hpp

src/scheme/DiscreteFunctionP0.hpp