HVR: Teleport on top of ladder

[JaXt0r]

Related to #124

Within XRIT, we implemented a feature, that an NPC will automatically spawn on top of the ladder, once close to the edge.
(GUZ.Core.Player.Climb.ClimbProvider.IsOnTop())

For HVR, we can leverage a spawn system, the framework provides us. It can be viewed inside the demo scene scene_examples.unity