multithreading for commandlets

Author: Roberto De Ioris

Source/UnrealEnginePython/Private/PyCommandlet.cpp

@@ -94,12 +94,16 @@ int32 UPyCommandlet::Main(const FString& CommandLine)
 		strcpy_s(argv[i], PyArgv[i].Len() + 1, TCHAR_TO_UTF8(*PyArgv[i].ReplaceEscapedCharWithChar()));
 #endif
 #endif
-}
+	}
 
 	PySys_SetArgv(PyArgv.Num(), argv);
 
+	Py_BEGIN_ALLOW_THREADS;
+
 	FUnrealEnginePythonModule &PythonModule = FModuleManager::GetModuleChecked<FUnrealEnginePythonModule>("UnrealEnginePython");
 	PythonModule.BrutalFinalize = true;
 	PythonModule.RunFile(TCHAR_TO_UTF8(*Filepath));
+
+	Py_END_ALLOW_THREADS;
 	return 0;
 }