8248122: java.base should not handle JavaFX application in a specific way

[Kartik Ohri]

Hi!
JavaFX is no longer a part of OpenJDK. It does not make sense to treat it
specially in the JDK. Hence, as suggested in JDK-
<https://bugs.openjdk.java.net/browse/JDK-8248122>8248122
<https://bugs.openjdk.java.net/browse/JDK-8248122>, the Launcher class
should be refactored to remove the JavaFX specific handling code.
Accordingly, I have proposed a patch here
<https://github.com/openjdk/jdk/pull/978>.

All suggestions are welcome. Thank you.
Regards,
Kartik