Undecorated Stages should display minimize & maximize animations on Windows

[Fluid Logix]

As the title says. Currently, undecorated Stages on Windows just instantly
disappear/appear when iconified/maximized. This looks quite unprofessional.

In addition to this, undecorated Stages cannot be minimized/restored by
clicking the taskbar-icon, without some JNA hackery.

For more details, see this StackOverflow post:
https://stackoverflow.com/questions/51008461/javafx-minimizing-maximing-undecorated-stage-with-animations