Finish decoding `AI11TextDocument`s
Changes
Decode the following parts of the AI11TextDocument
- Character style
- Paragraph style
- Font definition
- Listing style
- Frame (text position)
- Story (actual text)
Additionally:
- decode strings with UTF16 if required
- describe how texts are referenced in the main document
- plan which features can be implemented (and how), and which not.
Checklist
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Change is tested
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Change is documented.
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Licenses are up to date