- Separates values from the representation (base/radix) of those values.
- Uses a single base for all values represented as Rationals.
- Rationals are converted to/from a specific base when they are converted to/from strings.
* Converts NumObj* functions to use Rationals. Places new functions under CalcEngine::RationalMath namespace
* Moves functions that correspond to an operator to the Rational class with intent to convert to operators in the future
* Consolidates use of RatPack's NUMBER and RAT data types to Number/Rational classes and RationalMath namespace.
