Improve header encoding with folding#219

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tisdall wants to merge 3 commits intoDockYard:masterfrom

tisdall:add-header-folding

Commits on Dec 5, 2025

rework encode_header_value and fix spaces within and between encoded words
tisdall
committed
add header folding for most headers (not address types, message-id, etc)
tisdall
committed
update existing tests and add new ones to cover folding
tisdall
committed