py3: ported MeshPart to python3

src/Mod/MeshPart/Gui/AppMeshPartGui.cpp

@@ -67,14 +67,14 @@ PyObject* initModule()
 
 
 /* Python entry */
-PyMODINIT_FUNC initMeshPartGui()
+PyMOD_INIT_FUNC(MeshPartGui)
 {
     if (!Gui::Application::Instance) {
         PyErr_SetString(PyExc_ImportError, "Cannot load Gui module in console application.");
-        return;
+        PyMOD_Return(0);
     }
 
-    (void)MeshPartGui::initModule();
+    PyObject* mod = MeshPartGui::initModule();
     Base::Console().Log("Loading GUI of MeshPart module... done\n");
 
     // instantiating the commands
@@ -83,4 +83,6 @@ PyMODINIT_FUNC initMeshPartGui()
 
      // add resources and reloads the translators
     loadMeshPartResource();
+
+    PyMOD_Return(mod);
 }