Update to latest Arbutils, include stacktrace.

Signed-off-by: Deukhoofd <Deukhoofd@gmail.com>

tests/ExceptionTests.cpp

@@ -7,7 +7,7 @@ TEST_CASE("When throwing exception, what() is readable", "[Utilities]") {
     bool hasCaught = false;
     try {
         THROW_CREATURE("foobar");
-    } catch (const std::exception& e) {
+    } catch (const ArbUt::Exception& e) {
         hasCaught = true;
         INFO(e.what());
         REQUIRE(std::string(e.what()) == "[ExceptionTests.cpp:9] foobar");