Update samples

[jperedadnr]

to take into account Gradle 6.4+ for JDK 14+ and the recently published JavaFX gradle plugin 0.0.9

[nlisker]

@jperedadnr It seems that there's a need to update the examples and the dependency versions. For example, the Gradle version is 5.0 (https://github.com/openjfx/samples/blob/master/IDE/Eclipse/Modular/Gradle/hellofx/gradle/wrapper/gradle-wrapper.properties). Some of them don't work for me, and I see a lot of complaints in issues that weren't addressed. These examples are referenced from the JavaFX website and could be deterring users. Are there plans any to give them a overhaul? If not, I suggest unlinking them from the tutorials.

[abhinayagarwal]

Hi Nir,

Thank you for the nudge. Can you review #73 ?

[nlisker]

I can review the Eclipse and maybe some of the command line ones.