sceneconverter: print packed feature enums in error messages.

src/Magnum/SceneTools/Test/SceneConverterTest.cpp

@@ -537,7 +537,7 @@ const struct {
            get used for a mesh-to-mesh conversion */
         "-I", "ObjImporter", "-C", "StanfordSceneConverter", "-C", "StanfordSceneConverter", Utility::Path::join(SCENETOOLS_TEST_DIR, "SceneConverterTestFiles/point.obj"), Utility::Path::join(SCENETOOLS_TEST_OUTPUT_DIR, "SceneConverterTestFiles/whatever.ply")}),
         "ObjImporter", "StanfordSceneConverter",
-        "StanfordSceneConverter doesn't support importer conversion, only Trade::SceneConverterFeature::ConvertMeshToData\n"},
+        "StanfordSceneConverter doesn't support importer conversion, only ConvertMeshToData\n"},
 };
 #endif
 

src/Magnum/SceneTools/sceneconverter.cpp

@@ -665,7 +665,7 @@ the first mesh.)")
            importer instance) */
         } else {
             if(!(converter->features() & (Trade::SceneConverterFeature::ConvertMesh|Trade::SceneConverterFeature::ConvertMultiple))) {
-                Error{} << converterName << "doesn't support importer conversion, only" << converter->features();
+                Error{} << converterName << "doesn't support importer conversion, only" << Debug::packed << converter->features();
                 return 6;
             }