Custom delimiters are not always preserved in the HTML

[liffiton]

This plugin has to "protect" MathJax delimiters from Dokuwiki's parsing so that they are left unchanged in the HTML sent to the browser (where MathJax does its parsing). The plugin does not parse the MathJax config to see what custom delimiters may have been set, though, so it only protects the standard ones. #42 shows a case of using <m> delimiters for ASCIIMath, which breaks because Dokuwiki will convert < to < in the HTML sent to the browser. Custom delimiters like <m> work if you wrap them in %% to manually prevent Dokuwiki's parsing, but of course that's not an ideal solution.

Needed solution: parsing the MathJax config to protect just the delimiters set there.