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/Fem/Gui/ViewProviderFemConstraintBearing.cpp

@@ -67,7 +67,7 @@ bool ViewProviderFemConstraintBearing::setEdit(int ModNum)
 void ViewProviderFemConstraintBearing::updateData(const App::Property* prop)
 {
     // Gets called whenever a property of the attached object changes
-    Fem::ConstraintBearing* pcConstraint = static_cast<Fem::ConstraintBearing*>(this->getObject());
+    Fem::ConstraintBearing* pcConstraint = this->getObject<Fem::ConstraintBearing>();
 
     if (prop == &pcConstraint->References) {
         Base::Console().Error("\n");  // enable a breakpoint here