Support "Caret" annotation

[srenault-list]

It would be nice if the program could extract "Caret" annotations as well, which are the opposite of StrikeOut (suggestion of new text within a context).

[0xabu]

Thanks for the suggestion! Do you have an example of a PDF with such annotations?

[srenault-list]

Hi, sure. Here is a very basic example with one text addition (insertion) suggestion.
1_caret annotation example.pdf

It might be nice if pdfannots could return a bit of context (i.e. some of the text before and after the insertion suggestion) in addition to the text insertion suggestion.

[0xabu]

Quick update on this: the just-merged PR #102 adds some infrastructure for handling Caret annots and produces output for the specific case of a caret&strikeout pair, but doesn't usefully handle the bare insertion case in the example above so this stays open for now. I hope to get to it soon though.

[0xabu]

Now done. The output is a little ugly, but I couldn't think of anything much better.