Reimplement using Mustache templates #108
Description
MediaWiki's guide on making skins currently recommends that skins are implemented using the Mustache template engine (which is possible in MediaWiki since 1.25, and the zordius/lightncandy Packagist package is listed as being installed in Special:Version as part of MediaWiki).
It reduces the reliance on PHP and might solve several issues tagged on this repository about deprecated functions.