The guiders module separation no longer makes sense, so put the parts we're keeping (see https://trello.com/c/77At9zHq/357-deprecate-or-remove-guiders-methods) into other places and remove the guiders module.
Merge mediawiki.libs.guiders (based on Guiders-JS, but modified since then) into the rest of GuidedTour.
Version: master
Severity: normal