Docx reader: Allow for insertion/deletion of paragraphs.

If the paragraph has a deleted or inserted paragraph break (depending
on the track-changes setting) we hold onto it until the next
paragraph. This takes care of accept and reject. For this we introduce
a new state which holds the ils from the previous para if necessary.

For `--track-changes=all`, we add an empty span with class
`paragraph-insertion`/`paragraph-deletion` at the end of the paragraph
prior to the break to be inserted or deleted.

Closes #3927.

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