Added some types and strings, table for OS/ABI, added OS/ABI and ABI version to dump

It is not perfect (and, probably, it is worser than it was before), but, it is automatic

Crash 7d695153fd8052529d480c2352d4ada33a44bada

Static class members usually have to be defined explicitly which plays not
well with header only libraries. Moving the constant into the ELFIO scope
works around that problem.

The problem only shows up at -O0. Higher optimisations levels manage to
completely remove the references to the static member.