PreWindowScreen with Spinner
PreWindowScreen now contains Spinner and is able to use them, basically PreWindowScreen is ready to be used (Probably the design has to be improved as soon as I'm able to lunch Main / GameWindow without problems.) Spinner and ComboBox to do some bugfixing. A Listener in Spinner for valueBox need to be added, but I didn't know how TextBox is working, so left a TODO there.