Fix bug in markdown extension detector by removing ones that aren't markdown extensions.
In addition, fix how asciimathml is detected for the MathJax loading both for the GUI
and the site generator. Also don't forget to properly read the extensionConfig
in the site generator.
Provide UI for tweaking highlighter colors. Looks kind of cramped though,
and doesn't use the color widget that I wrote yet. Will integrate
the color widget that I wrote after I get around to uploading it.
Optionally integrate slickpicker. Fallback to QLineEdit if we
can't find it. Also, put the color editing widgets in a scroll area.
Prep Changelog for 0.3.7 and bump version number
Update the README to reflect current dependencies. Not entirely sure
how I skipped over this.