Legacy ART Hollow Ellipse mark.

Members:

IG_ARTX_hollow_ellipse_border_get	Queries filling color of ellipse annotation.
IG_ARTX_hollow_ellipse_border_set	Updates ellipse annotation filling color.
IG_ARTX_hollow_ellipse_bounds_get	Queries ellipse bounding rectangle.
IG_ARTX_hollow_ellipse_bounds_set	Updates ellipse bounding rectangle.
IG_ARTX_hollow_ellipse_create	Creates an instance of ellipse mark (IG_ARTX_MARK_HOLLOW_ELLIPSE).
IG_ARTX_hollow_ellipse_highlight_get	Queries the highlight state of annotation.
IG_ARTX_hollow_ellipse_highlight_set	Sets highlight state of annotation.