[LSC Request] End of header meta command

[Chris Dee]

The meta statement sequence defined in the header spec is enforced for official parts (except maybe that !HELP lines can appear anywhere), and I'd still prefer !HISTORY to be the last header info as that is the part that grows.

My preference would be to add zero or more "0 !NEEDSWORK " meta statements immediately before the !HISTORY.

Every official part has at least one !HISTORY line, because the Parts Update mechanism generates one, so header parsers can then ignore everything after the last !HISTORY line.