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

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.

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.

TO DO: add the functions to link road segments.