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Initial operator for mod implimentation and test cases for integer and floating based types.

Need to use fmod from stdlib for floating point types. half_float::half thankfully is specced to the use the existing std::fmod() call when looking at the half.hpp implimentation.

fmod_flag should mirror the onnx fmod attribute. Right now using a floating point type without setting that on the user side to true will result in an exception.

Ref ticket #1283

Double,float and half use their own typename specification to achieve this, otherwise we rely on the % operator to get the integer remainder while preserving sign of the dividend to the result.