PowerPoint writer: Implement notes

This currently prints all notes on a final slide.

Note that at the moment, there is a danger of text overflowing the
note slide, since there is no logic for adding further slides. A
future commit will shrink the font size on these notes, but that won't
take care of the problem altogether. (We might have to implement some
sort of clumsy page-breaking logic here based on font size and
text-box dimensions, though that seems like a can of worms.)

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