Added functions to update all the references when a new road is created.

Added functions to create a copy of the segment and update its references.
Added a function to clean any invalid reference.

Added functions to create a copy of the lane and update its references.
Added a function to clean any invalid reference.
Added a function to get the closest point on the lane to a given point.

Added functions to create a copy of the node and update its references.
Added a function to clean any invalid reference.

Added the forward declaration of all classes.

Added functions to update the start and end positions of the link.
Used a single update_reference() function with all the new segment,lane and node references.

Added the path to the Find cmake file and CMakeLists.txt files.

  * A function to get the closes node to a point.
  * A function to get the set of closest points to a point.

  * A function to get the link ending at a given node.
  * A function to get the closest link to a point.
  * A function to get the set to closest points to a given point.

Found a bug (not yet solved): The contact point information is needed when linking junction roads.

Solved a bug: In the add_nodes() function: the width attribute is used instead og the get_width() function to get the actual width (not scaled by the scale_factor).

Got the curvature information to generate the spline for each link.

  * New nodes are first linked before adding them to the lane. This avoids using invalid lane end positions.
  * In the get_start_point() and get_end_point() functions: the lane object address is compared instead of the lane ID.
  * In the get_start_point() and get_end_point() functions: for left lanes, the last node is used instead of the first one to get the desired point.

Added functions to get the spline trajectory (with and without heading).

Removed the parameter constructor.
Implemented the function to get the start and end curvature.
Solved a bug: the min_s parameter is not needed to compute the local coordinates.

Removed the parameter constructor.
Implemented the function to get the start and end curvature (removed the get_start_curvature() and get_end_curvature() functions).
Solved a bug: the min_s parameter is not needed to compute the local coordinates.

Removed the parameter constructor.
Implemented the function to get the start and end curvature (removed the get_curvature() function).
Solved a bug: the min_s parameter is not needed to compute the local coordinates.

Removed the parameter constructor.
Implemented the function to get the start and end curvature.
Solved a bug: the min_s parameter is not needed to compute the local coordinates.

Removed the parameter constructor.
Added an abstract function to get the start and end curvature.

Added the scale factor attribute. Used to scale teh pose of the object as well as its dimensions.
Added a function to get the pose of the object in world coordinates.

Added the scale factor attribute. Used to scale the position of the signal
Added a function to get the world pose of the signal.

Completed the feature to copy the whole structure and update the references.

Added a referecne to the parent road segment in the COpendriveRoadNode class.
In the destructor, only the link starting at the current node are deleted to avoid double free.

Added a function to return the length of a lane.
Solved a bug with the names of the road marks.
Solved a bug when kinking two nodes in the same lane.

Road nodes from diferent roads at the same location are fused.
Road nodes can belong to multiple lanes: each has a vector of parent lanes and geometries.