Bump Vue.js to 7693501f2 .
Revert to dash-separated data attributes, since Vue.js was updated to a version that handles these properly.
Vue.js conversion: "number of comments" indicator/text, and other related conversions.
Create a ListSyncer subclass of Vue.
Put comment like and unlike functions on Libertree.Comments.ListSyncer class.
Vue.js conversion: Comment tool visibility.