Add inline specifiers to make_size_tag, prologue and epilogue
Add inline specifiers to make_size_tag, prologue and epilogue

It looks like that MSVC doesn't want to inline make_size_tag, and it has an impact on performance. I haven't seen the problem with prologue and epilogue functions. In anyways, just for the sake of consistency with other wrappers, inline looks sensible here.
adasworks/cereal,fawkes74/cereal,jkhoogland/cereal,fawkes74/cereal,USCiLab/cereal,abutcher-gh/cereal,abutcher-gh/cereal,jkhoogland/cereal,USCiLab/cereal,adasworks/cereal