Provide generic hasher for enum classes about cppassist HOT 4 OPEN

I think we'll need a new submodule name for such a class (and many to follow).
It's a explicit extension to standard library concepts with the contexts hash and enum class.
Any ideas? @sbusch42 @cgcostume

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Seems like C++14 and 17 added support for this with their respective stdlibs. However, as we develop cppassist using C++11 I think we have to provide fallback implementations for older compilers and stdlibs.
We will have to find code to detect whether hashing is already provided by the stdlib.

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is this required? and we should think about switching to C++14?

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I think an upgrade to C++14 becomes feasible, soon.
Fortunately, such an upgrade would imply the removal of some more implementations in cppassist.

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