Parametrised scatters (Ported from track-fit-workshop branch)

Laurent Dufour requested to merge parametrised-scatters into master

This MR adds the parametrised scatter concept to the TrackMasterFitter. Certainly not the end-product, nor probably the place where this will continue on living.

Enabled by property FastMaterialApproximation in TrackMasterFitter.

We should probably enable this by default in the Moore configuration, and regenerate quite a few references.

See slide 5 to 9 for a description.

Edited by Sascha Stahl

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