To display the sum of the post and comment upvote and downvote. If a post has 3 likes and 5 dislikes, it will display the number -2 on the post. If a comment has 5 likes and 3 dislikes, it will display 2 on the comment.

I WANT TO BE CLEAR. I AM NOT AVOCATING FOR REMOVING OR REPLACING THE LIKE AND DISLIKE NUMBER DISPLAY. I LIKE THAT THUNDER TELLS YOU HOW MANY LIKES A POST AND COMMENT HAS AND HOW MANY DISLIKES A POST AND COMMENT HAS.

COMPLETED: Thanks to hjiangsu on Github https://github.com/thunder-app/thunder/pull/1077