Rename "reverse_endianness" to "endian_reverse". Shorter but still plenty explicit. See bikeshed.txt for alternatives considered.
Add comment about Requirements so it won't be forgotten.
Add associated-files.vcxproj and related infrastructure so Visual Studio IDE find-in-files and replace-in-files works for associated files like headers and HTML files.
Rename "runtime_conditional_reverse" to "conditional_reverse". The differing number of arguments is sufficient to disambiguate the compile-time and run-time overloads.
Change "in_place" to "inplace". Rationale: shortens names without impacting expressiveness.
Minor editing tweaks.