Fixing member variable naming

[ChSonnabend]

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[ChSonnabend]

Not sure about
struct OrtVariables;
OrtVariables* pImplOrt;
in OrtInterface.h

[davidrohr]

Not sure about struct OrtVariables; OrtVariables* pImplOrt; in OrtInterface.h

OrtModel is a class, so obviously it should also start with "m", so make it OrtVariables* mPImplOrt or whatever you like.