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Syntax highlighting improvements

Robert Speicher requested to merge rs-fix-highlighting into master

On the server side:

During development I would occasionally see SanitizationFilter sanitizing the result of SyntaxHighlightFilter, even though its attributes were whitelisted. This updates the clean_spans transformer to return the whitelisted node as suggested by the Sanitize docs.

On the client side:

  • Makes the syntax_highlight JS more flexible
  • Adds JS specs
  • Simplifies highlighting of new notes
  • Adds highlighting to Markdown preview

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