Improves formatting
Improves formatting

Improves chula_buffer_repr() so it looks more like the “hexdump -C”
command. Also, it fixes the index of the dump so the right offsets are
shown.

http2d/core,http2d/core,alobbs/libhpack,http2d/core,http2d/core,alobbs/libhpack,alobbs/libhpack,alobbs/libhpack