Function: Check if user vote on a post.
Function: Get a single vote from database.
Function: Get votes count.
Function: Output or return voting button.
Function: Return votes.
Method: Update user meta of vote
Filter Hook: Filter to hijack ap_user_can_vote_on_post.
Function: Check if user is allowed to cast a vote on post.
Method: Handle ajax vote in wp-admin post edit screen.
Method: Ajax callback for ‘ap_recount_votes` which recounting votes of posts.