Enums should be pure and offer Eq instances

I'm using the following types in my little application and it would be much more convenient if they would be defined as pure:

```
javafx.scene.input.KeyCode
javafx.geometry.VPos
javafx.scene.text.TextAlignment
```

And it would be nice if they would come with Eq instances or at least with equals and hashCode bindings. 
This applies to most enums.
