Add track information to evaluation of vertex finding performance

• Develop vertex finding performance evaluation by using information from the track-to-vertex association.
• Create new derived vertex class which can store selected tracks belonging to vertex and edit existing software to use this new class.
• Develop new matching class for the new vertex class that provides a more detailed evaluation of the vertex finding performance by matching offline and trigger vertices on a track-by-track basis. An offline vertex is matched to a trigger vertex if at least 50% of tracks belonging to the offline vertex are matched to those belonging to the trigger vertex. This replaces previous matching based only on z-position of vertices.