(Internal) Plot audit trail of a single examinee
plotShadowAudit is an internal function for plotting audit trail of a single examinee, showing interim theta estimates over the course of an adaptive test.
plotShadowAudit(x, theta_range, z_ci, use_par, ...)
x: an output_Shadow object.theta_range: the theta range to use on the y-axis.z_ci: the confindence interval value to use in the z metric. z_ci = 1.96 is equivalent to plotting 95% error bars.use_par: TRUE allows this function to set graphic margins through par....: not used.