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/ViewProviderProjectOnSurface.cpp

@@ -64,7 +64,7 @@ bool ViewProviderProjectOnSurface::setEdit(int ModNum)
             return false;
         }
 
-        if (auto feature = dynamic_cast<Part::ProjectOnSurface*>(getObject())) {
+        if (auto feature = getObject<Part::ProjectOnSurface>()) {
             Gui::Control().showDialog(new TaskProjectOnSurface(feature));
             return true;
         }