update point reflection along line, point along line and polar sort w…

[st3inum]

• added polar sort w.r.t point o
• point_along_line function should not return a when a == b, because it dont mean any line.
• in reflection_from_point_to_line, we can just simply return 2 p - c, which is much more efficient than point_along_line(c, p, 2.0 dist(c, p))

[ShahjalalShohag]

cool