RFR: 8289255: update Eclipse .classpath and other configuration files [v7]

[Nir Lisker]

On Thu, 7 Jul 2022 20:37:29 GMT, Andy Goryachev <duke at openjdk.org> wrote:

> This PR does not fix apps/ project. In fact, I think .project in apps/ should be removed, and instead we should create individual projects, either for a group (i.e. samples, toys), or for each application (i.e. Robot, 3DViewer).
> 
> This work depends on the cleanup. We could probably do it in a separate bug. What do you think?

That's fine, but I saw that you changed the 3DViewer and Ensemble8 files, and there are still errors there, so either leave apps completely out of this PR or bring it to a point where there are no errors.

As in my branch that I linked above in the review comment, I also created a separate project for each app. The `apps` project itself still needs a .project file because it's a gradle project that is created automatically by the gradle build. It doesn't need to be a Java project though, so the .project file can have the gradle nature only.

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PR: https://git.openjdk.org/jfx/pull/804