Fix image description unnecessarily html-escaping innocent characters #321
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This PR implements a SanitizeCaption function in the text formatter for processing image descriptions. It's similar to other text-formatting functions in that package, but it doesn't format text into html, it just preformats, unescapes, and postformats.
This resolves an issue where characters like
'
were being HTML-escaped in image captions, which led to weird-looking alt-text.Closes #305