Remove MetaProgrammingLibrary and replace by C++14 STL equivalents

[dzenanz]

Since we started requiring C++11 itk::mpl is fairly redundant. Even more so now that we require a minimum of C++14. It is desireable to completely remove this and rely on standard template library and language features directly.

Part of this is already accomplished, mostly by #2730, but also in part by d3e151f09d04830c8ef6ac2f2b104d247ffb99f3 and perhaps some other, earlier refactoring.

[dzenanz]

All the involved files are in https://github.com/InsightSoftwareConsortium/ITK/tree/master/Modules/Core/Common/include:

• itkMetaProgrammingLibrary.h
• itkIsNumber.h
• itkIsConvertible.h
• itkVariableLengthVector.h

A work-in-progress branch is in my repository: https://github.com/dzenanz/ITK/commits/cmake320policies.

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