Legacy ART Redaction mark.

Members:

IG_ARTX_redaction_bounds_get	Queries the bounding rectangle of annotation.
IG_ARTX_redaction_bounds_set	Updates the bounding rectangle of annotation.
IG_ARTX_redaction_create	Creates an instance of redaction mark (IG_ARTX_MARK_REDACTION).
IG_ARTX_redaction_fillcolor_get	Queries filling color of annotation.
IG_ARTX_redaction_fillcolor_set	Updates annotation filling color.