Bug fixes for extrapolation

Bug fixes related to extrapolation

v3.0.0

This tag includes substantial reorganization of the magentic field inhomogeneity correction, and infrastructure needed to extrapolate tracks beyond the fit region.

Tag for fixes

Tag changes required for fitting shallow CentralHelix tracks and for compiler updates.

Update to c++20

No actual code change, just CMake flags.

Intersection fixes

Bug fixes and implementation improvements for intersection methods.

Geometry fixes

Refinements, fixes and extensions to Geometry and Intersection classes.

v2.4.0

Define basic geometry classes and implement intersection methods. These will be used for fit extrapolation and sampling.

v2.3.1

Protect end processing

v2.3.0

Release to fix RPATH problems, resolves issue 166

v2.2.1

Bug fixes to deltaT derivatives and line traj range. Change KLine parameterization. Small interface additions and implementation simplification.