Support for NavmeshLinks #79
Description
This would allow for bidirectionally or height for 2d navmeshes.
User should be able to drop down from the cliff (an obstacle) to the ground with via NavmeshLink but if they want to go back to the cliff they would have to navigate around the obstacle (cliff)
https://docs.unity3d.com/560/Documentation/Manual/class-NavMeshLink.html
By making the NavmeshLink NOT bidirectional it's entry point is on top of the cliff and not below it.
The way I figure is that NavmeshLink could be a special obstacle that has one or two pathable points that is taken into account during the pathfinding as a tunnel.
Pathing from A to C would take a NavmeshLink between into account if it its entry point is enabled (meaning bidirectional)