* craft-y4m: YUV4MPEG2 reader
FilmCraft's Y4M reader as a crate: the stream header, colour space layouts,
a frame index built from the FRAME lines through a read callback, and plane
ranges. The media source and frame types stay in the app.
* craft-y4m: a header parameter starting with a multi-byte character is ignored
Port of storytold/filmcraft#4562: the tag of a stream header parameter is its
first character, not its first byte, so a parameter such as `éX` is skipped
like any other unknown tag instead of being split inside the character.
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Co-authored-by: NetterSilver <133535268+Silvertree2010@users.noreply.github.com>
