This patch adds (basic) support for Mustache templates in LexHTML. Mustache is a template language with wide language support, which is mainly used for websites.
The template language itself is very thin, containing no logic, and does not embed or depend upon another language (unline Django or Mako), so this patch mainly adds hooks for syntax highlighting (which I've worked on for Geany, I'm not quite sure how SciTE works in that respect). The only thing I could conceivably add is automatic tag closing for sections and inverted sections, but I'll need some more time (or help) for that.
Feel free to berate me about the code quality and/or any missing features.