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Add basic functionality for extrapolation in ParticleVertexFitter

Izaac Sanderswood requested to merge isanders-add-state-provider-to-PVF into master

ParticleVertexFitter currently relies on TrackTraj, which is an approximation of the trajectory based on the measured momentum. It fully relies on existing states already on the track.

Without extrapolation, this leads to a very large bias in both the mass and z position of the vertex for combinations with T tracks.

This change adds minimal functionality for extrapolation. More work is planned in future to improve and optimise.

Edited by Izaac Sanderswood

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