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RST reader: Fix nested placeholder resolution for inline elements (#11753)
PPTX writer: keep tables and surrounding text on same slide (#11411)
Update copyright dates to 2024.
Add `xlsx` (Microsoft Excel) as an input format.
Fix test suite parallel execution failures.
Add Txt2Tags writer (#11699).
Avoid use of 'head' in Tests.Shared.
New `xml` format exactly representing a Pandoc AST.