Apple Java Extensions still needed?

[stefan-kolb]

Do they still make any sense?https://developer.apple.com/legacy/library/samplecode/AppleJavaExtensions/Introduction/Intro.html

[Siedlerchr]

At least with Java 9 they are obsolete and with JavaFX no longer needed. But we still have one or two dialogs who use them.

[stefan-kolb]

Refs #3861

[koppor]

So full steam ahead for the JavaFX migration. 🎉

[Siedlerchr]

Refs #3421