~sircmpwn/hare-message

Decode and encode non-ascii header values (UTF-8)

Non-ascii strings are represented as "encoded-words" as defined in
RFC 2047:
https://datatracker.ietf.org/doc/html/rfc2047

This commit handles only UTF-8 charsets, both "B" and "Q" encodings.
Update for checkless for loops
message: more stdlib changes

Signed-off-by: Conrad Hoffmann <ch@bitfehler.net>
all: update per upstream stdlib changes
Add round-trip test
message: implement read_header
message::new_header: clarify interaction with DKIM
message: move header functions around
message: implement header_write
message/header: implement header encoding/raw ops
header: flesh out a bit more
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