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Added a ValueType trait to TypeInfo.

Podhorszki, Norbert requested to merge github/fork/chuckatkins/add-value-type-trait into master

Created by: chuckatkins

This will allow for generic template functions that can deal with complex types using thier underlying value types. So rather than have to split definitions like:

template<T> T foo(const T&);
template<T> T foo(const std::complex<T>&);

to handle the case where an std::complex should use a float return value, you can now use a single signature:

template<T> TypeInfo<T>::ValueType foo(const T&);

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