Add BorderRadius/Rounded Corners

[Robby3St]

Is your feature request related to a problem? Please describe.
In SoPra, we got a GUI concept which massively depends on rounded corners on Buttons, Textfields and overall. But as far as I see, there is nothing like BorderRadius yet.

Describe the solution you'd like
I would like to have a setting for Buttons, which allows to set the BorderRadius value in px for each GUI element.

Describe alternatives you've considered
Not using rounded corners, but unfortunately, this doesn't look that good with our GUI concept.

[Robby3St]

Might be arcHeight and arcWidth for Rectangle Shape: https://docs.oracle.com/javase/8/javafx/api/javafx/scene/shape/Rectangle.html

It looks like setting the Shape of the Button could work. This is what I've found so far, but I'm not that used to JavaFX.