Legacy ART Highlighter mark.

Members:

IG_ARTX_highlighter_bounds_get	Queries the bounding rectangle of annotation.
IG_ARTX_highlighter_bounds_set	Updates the bounding rectangle of annotation.
IG_ARTX_highlighter_create	Creates an instance of highlighter mark (IG_ARTX_MARK_HIGHLIGHTER).
IG_ARTX_highlighter_fillcolor_get	Queries filling color of annotation.
IG_ARTX_highlighter_fillcolor_set	Updates annotation filling color.