Fix --traverse --exlucde=<entities|layers> + clean up duplicate code. filter::traverse_match: dynamic_cast instead of static_cast as the decomposing entity is not guaranteed to be IfcProduct

src/ifcconvert/IfcConvert.cpp

@@ -596,7 +596,7 @@ int main(int argc, char** argv)
 	}
 	Logger::Status(msg.str());
 
-    return successful ? 0 : 1;
+    return successful ? EXIT_SUCCESS : EXIT_FAILURE;
 }
 
 void write_log() {