Header-only C++11 library to encode/decode base64, base64url, base32, base32hex
and hex (a.k.a. base16) as specified in RFC 4648, plus Crockford's base32.

MIT licensed with consistent, flexible API. Supports raw pointers, std::string
and (templated) character vectors without unnecessary allocations.
Cross-platform with measured decent performance and without compiler warnings.