Adds an icon to the author section in the embed.
$authorIconwill not work if there is no text provided in
(Type: URL || Flag: Emptiable): The image for the author icon. This must be a valid image URL.
(Type: Integer || Flag: Optional): To which embed the author icon will be added. (learn more)
$nomention $authorIcon[$authorAvatar] $author[⬅️ That is the author icon. This is the author text.]