MDL-38171 editpdf: Comments menus are in their own class.
MDL-38171 editpdf: standardizing all the coordinate conversions.
MDL-38171 editpdf: comment search moved to it's own class
MDL-38171 editpdf: Converted all the annotations to subclasses (except stamp)
MDL-38171 editpdf: Added draw_current_edit to all annotation/comment subclasses.