AStar: Get a list of connected points

[Timofffee]

Please add the ability to list points that were connected with the current point.
[p_index, ...] <- get_point_conections(p_index)
For example:

var astar = AStar.new()
astar.add_point(1, Vector3(30, 30, 3))
astar.add_point(2, Vector3(23, 30, 0))
astar.add_point(3, Vector3(41, 32, 3))

astar.connect_points(1, 2)
astar.connect_points(1, 3)

print (astar.get_point_connections( 1 ))
# [2, 3]

[lmcdd]

Yes, it's very useful!