Multi adaptive vertex fitter

Implements the multi adaptive vertex fitter and all related required tools.

Core/include/Acts/Vertexing/IVertexFitter.hpp

@@ -12,6 +12,7 @@
 
 #include "Acts/Geometry/GeometryContext.hpp"
 #include "Acts/MagneticField/MagneticFieldContext.hpp"
+
 #include "Acts/Utilities/Definitions.hpp"
 #include "Acts/Utilities/Result.hpp"
 #include "Acts/Vertexing/Vertex.hpp"
@@ -30,6 +31,7 @@ struct VertexFitterOptions {
   /// @param gctx The goemetry context for this fit
   /// @param mctx The magnetic context for this fit
   /// @param pconstraint The pointing contraint to a vertex
+
   VertexFitterOptions(std::reference_wrapper<const GeometryContext> gctx,
                       std::reference_wrapper<const MagneticFieldContext> mctx,
                       const Vertex<input_track_t>& vconstr =