Gui: Use getObject<T>() helpers in classes

This commit is generated using regex based find and replace:

```
s/[\w:]+_cast\s*<([^>]+)\*>\s*\(\s*getObject\(\s*\)\)/getObject<$1>/
s/[\w:]+_cast\s*<([^>]+)\*>\s*\(\s*([^)]*)\s*->\s*getObject\(\s*\)\)/$2->getObject<$1>()/
```

To regenerate if needed.

src/Mod/Part/Gui/ViewProviderPrimitive.cpp

@@ -65,7 +65,7 @@ bool ViewProviderPrimitive::setEdit(int ModNum)
         if (Gui::Control().activeDialog())
             return false;
         PartGui::TaskPrimitivesEdit* dlg
-            = new PartGui::TaskPrimitivesEdit(dynamic_cast<Part::Primitive*>(getObject()));
+            = new PartGui::TaskPrimitivesEdit(getObject<Part::Primitive>());
         Gui::Control().showDialog(dlg);
         return true;
     }