reimplementing track system

[patrick]

Reimplementaion of the track system using parenting. A Track now should be a collection of TrackNodes. The track between the nodes is connected via B-Splines or NURBS, whatever is more usefull.

• Concrete use:
  • a player able to be guided through the world via track
  • a player able to choose between different tracks = different ways thourgh the world

• Requirements:
  • there is one or more HelperParent lead/bound by the track (multi/single player)
  • the movement of a HelperParent on the track must be smooth (therefore using some splines)
  • calculation of position and orientation of the HelperParent must be cheap
  • the track must be able to calculate the current position on the track from the variable x, representing the way, that the HelperParent has moved yet.

• Implementation:
  • function to add/remove TrackNodes
  • function to get the current position of the HelperParent on the Track
  • function to get the current orientation of the HelperParent on the Track
  • function to set the current postion on the Track (via time or distance)

[bensch]

Doxygen documentation of TrackManager (not complete)

[bensch]

Written most headers, and added all the doxygen-comments:
see [3330] for more info.