NHTSA scenarios update

[rodrigoqueiroz]

• This branch contains a set of improvements on TrafficState, intersection handling, and retrieving Lanelet detailed data for intersections.
• Use of opposite traffic during maneuvers, if requested by BTree node.
• Updated NHTSA scenarios (partial) to work with recent version of the GSServer and use the intersection handling.
• Minor changes scattered around the code for compatibility.

[rodrigoqueiroz]

Tested on most core_test scenarios.