Shalom

I've added support for small_vector to the C++ Middleware 
Writer.  

While testing the support, I got a warning about dereferencing a
type-punned pointer breaking strict-aliasing rules.  That was on
line 340 of small_vector.hpp.  I was using g++ 7.1 on FreeBSD/
TrueOS.

I used the following "Middle" code for testing:

message-lengths    variable
example_messages
    -out (message_id_8, ::boost::container::small_vector<int32_t,30>)
    -in                           (::boost::container::small_vector<int32_t,30>)
}


From what I could tell the serialization/deserialization worked fine.

If small_vector were broken out into a separate library
that would be helpful from my perspective.  It would make
it easier for me to add small_vector to my example code.


Brian
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