Move dependencies in 'external' directory and pdate git submodules

external/Catch2/tests/SelfTest/IntrospectiveTests/AssertionHandler.tests.cpp

@@ -0,0 +1,17 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
+#include <catch2/catch_test_macros.hpp>
+
+TEST_CASE( "Incomplete AssertionHandler", "[assertion-handler][!shouldfail]" ) {
+    Catch::AssertionHandler catchAssertionHandler(
+        "REQUIRE"_catch_sr,
+        CATCH_INTERNAL_LINEINFO,
+        "Dummy",
+        Catch::ResultDisposition::Normal );
+}