A comment is the text data for a comment
Creates a new comment object
The index of this author in a unique sorted list of all authors in the comment.
The owning Comments object
initialize the vml shape based on this comment's ref/position in the worksheet. by default, all columns are 5 columns wide and 5 rows high
The string based cell position reference (e.g. 'A1') that determines the positioning of this comment
serialize the object
The vml shape that will render this comment