Multi adaptive vertex fitter

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

Tests/Core/Vertexing/KalmanVertexTrackUpdatorTests.cpp

+// This file is part of the Acts project.
+//
+// Copyright (C) 2019 Acts project team
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// clang-format off
+#define BOOST_TEST_MODULE FullBilloirVertexFitter Tests
+#define BOOST_TEST_DYN_LINK
+#include <boost/test/unit_test.hpp>
+#include <boost/test/data/test_case.hpp>
+#include <boost/test/output_test_stream.hpp>
+// clang-format on