Docxcompose

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- Prevent artifacts of previously cached doc property values during update. [deiferni]

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- Fix updating doc-properties with non-ascii names. [deiferni]
- Don't handle hyperlink references twice. [deiferni]

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- Implement generic handling of referenced parts. Among other, this adds
support for embedded Excel charts.
[buchi]

- Handle embedded SVGs.
[buchi]

- Add styles from other parts, e.g. footnotes.
[buchi]

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- Fix list-styles being set incorrectly when restarting numberings.
[deiferni]

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- Fix setting section type for appended documents with only one section.
[deiferni]

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- Fix handling of section type.
[buchi]

- Fix an issue where the listing style of the first element was different.
[deiferni]

- Fix issue when restarting intermittent numbering.
[deiferni]