Move build information functionality into new `BuildInfo.h` header.
Fix formatting issues in credits list.
Add missing libraries to library list.
Fix translation issues for contributor credits.
Hide ugly macro and `#ifdef` usage inside `BuildInfo.h`.
Convert some `#ifdef` usage into `constexpr` uses.
Reassure the compiler that the compiler specific version macros exist.
Reference-to: https://github.com/tenacityteam/tenacity/pull/361
Signed-off-by: Emily Mabrey <emabrey@tenacityaudio.org>
a8e9a0053d