Enable voting on comments

This dynamic configuration parameter can be used to configure user voting on comments.

• When set to On, every comment card will contain a score and a set of upvote/downvote buttons. Also, any commenter will be able to upvote or downvote others’ comments (bot not those they authored self).
• If set to Off, the score and the voting buttons will be hidden. It will also disable sorting comments by votes.