Another fast implementation (plain C99, without using SIMD), supporting buffer aliasing (i.e. allowing in-place encoding/decoding, check senc_b64() and sdec_b64

Another fast implementation (plain C99, without using SIMD), supporting buffer aliasing (i.e. allowing in-place encoding/decoding, check senc_b64() and sdec_b64() functions): https://github.com/faragon/libsrt/blob/master/src/saux/senc.c https://github.com/faragon/libsrt/blob/master/src/saux/senc....