Darkslide

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* Fixed underline occlusion shadows in the footer (for links).
* Fixed missing `presenter_notes` class not being set when notes mode was on.

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* MathJax is loaded on HTTPS.

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* The Darkslide version is shown in the help sidebar.

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* Fixed config file parsing for math_output.

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* Now macro failures abort rendering. Previously they would just log a message that you'd probably woulnd't notice.
* Fixed broken handling where you have css/js in the cfg file.
* Allowed setting the math_output option in the cfg file.
* Fixed encoding issues in the QR macro.
* Added back the old theme with completely black background (as "void").
* Tweak the faux underlines to look better.

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* Added demo links.
* Fixed options handling. Options from command line now will actually work if a cfg file is used.
* Corrected relative paths handling:

- paths in sources are now relative to the cfg file (previously they were relative to whatever was cwd).
- relative option now correctly works when destination file is not in cwd.
* Fixed layout of slides with many headering (no more paddings for headings, all root elements are spread out evenly
anyway).
* Fixed bad styling of ToC (and probably other things in the sidebar).
* Fixed ToC links (contributed by Cyrille Pontvieux).