Upgrade mistune#81

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galund wants to merge 12 commits into

iamjackg:developfrom

alphagov:upgrade-mistune

Commits on May 18, 2023

Upgrade Mistune to version 3 (release candidate, so tentative)
galund
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New version of mistune always escapes quotes using " entity
galund
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Include demonstration of forcing a line break using two spaces
galund
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New version of Mistune treats blockquotes separate by a blank line as separate elements
galund
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New version of Mistune puts <blockquote> on a line of its own
galund
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The number of the first item in an ordered list affects the resulting markup
galund
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Keep ConfluenceRenderer handling of code blocks same as Mistune MarkdownRenderer
galund
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Align implemention of block_code with that in Mistune HTMLRenderer
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Fix unit tests given renamed header/heading function
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Adjust unit tests to account for parameter order change
galund
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Add tests for both ways of handling newlines
galund
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Newline removal now has to be done in parsing rather than rendering due to the Mistune upgrade
galund
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