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Illuminates area covered by circle defined by xc, yc, and r. The illumination bit is set with b_illum. The light will collide with pixels set to bit b_coll. Uses LoS (line of sight) lighting, where each pixel that falls in the bounds of the circle is checked to determine whether or not it has a straight line of pixels set to bit !b_coll from the point to the point {xc, yc}.